The assistant( B)her did not like the way she was dressed.

The assistant( B)her did not like the way she was dressed.
A served B serving C who serving D was serving为什么选的是B.A不是更正确吗,它是过去式啊,而跟B有什么关系啊
什么事所谓的后置定语?

serving是做定语的 .对名词的一种解释 ,served 后面一般跟by sb.做被动
下面是对后置定语的解释：
后置定语
形容词是表示人或事物的性质、特征或属性的一类词.它在句中可以充当定语,对名词起修饰、描绘作用,还可以充当表语、宾语补足语等.形容词作定语修饰名词时,一般放在被修饰的名词之前,称作前置定语.但有时也可放在被修饰的名词之后,称作后置定语. 1. 当形容词修饰由every-、some-、any-、no-加body、one、thing等构成的复合不定代词时须后置.例如： Have you ever met anyone famous ? 你曾经见过名人吗? He did everything possible to help us . 他做了一切可能做的来帮助我们. There is something wrong with the computer . 这台电脑出毛病了. 注意：若something 前面有定冠词修饰,形容词不用后置.例如：There , on the table , was the mysterious something that they had been looking for . 看,在桌子上,正是他们一直孜孜以求的神秘的东西. 2. 形容词组作定语须后置,其功能相当于一个定语从句.例如： _________ to take this adventure course will certainly learn a lot of useful skills . A. Brave enough students B. Enough brave students C. Students brave enough D. Students enough brave They are the boys easiest to teach . 他们是最容易教的孩子.（划线部分相当于who are easiest to teach） The basket full of some fruits belongs to the old woman . 盛满各种水果的这个篮子是这位老妇人的.（划线部分相当于which is full of some fruits ） Those brave enough to take the course must be the top students in the grade . 那些敢于选修这门课程的学生一定是本年级的尖子生.（划线部分相当于who are brave enough） 3. 两个形容词用and 或or连接作定语,进一步说明被修饰名词的作用,此时须后置.例如： Power stations , large and small , have been set up all over the country . 大大小小的水电站已经在全国各地兴建起来了.（划线部分相当于which are large and small） Every book , new or old , should be put in the room . 不论新书还是旧书都应该放在这个房间里.（划线部分相当于which are new or old） 4. 形容词else常位于不定代词或疑问代词后作定语.例如： Anything else I can do for you ? 我能为你做些别的事情吗? What else did they say ? 他们还说了些什么? 5. 形容词比较等级结构修饰名词时须后置.例如： The Smiths need a car garage twice larger than this one . 史密斯夫妇需要一个比这个大一倍的车库. He has booked the seat farthest from the door on the train for us . 他已经为我们预定了火车上离车门最远的座位. 6. “基数词+表示时间或度量单位的名词+形容词”结构可用来修饰名词,起定语作用.此时,该类结构的词组须后置.例如； Yesterday , a Mr Brown , 28 years old , came to visit you . 昨天,一位二十八岁,自称是布朗先生的人来拜访过你. There used to be a tall building about 50 metres high . 过去,这里曾经有一座大约50米高的大楼. 7. 部分以a-开头的表语形容词,如：alive , alike , alone , awake 等,有时也可以作定语修饰名词.此时,须将该形容词置于被修饰的名词之后.例如： She was the only person awake at that night . 她是那天晚上惟一一个醒着的人. You are the happiest children alive . 你们是当代最幸福的孩子. 8. 形容词responsible 作“可信赖的；可靠的”解时,作前置定语；作“有责任的；应负责的”解时,须作后置定语.例如： He is a responsible man . 他是一个可以信赖的人. The man responsible should be their manager . 负责任的应该是他们的经理. 9. 形容词present 作“现在的；目前的；现存的”解时,作前置定语；作“出席的；在场的”解时,须作后置定语.例如： What is your present address ? 你现在的住址是什么? The present international situation is excellent . 当前的国际形势一片大好. The professors present at the meeting came from Shandong University . 出席这次会议的教授们来自山东大学. The students present welcomed the decision . 在场的学生都欢迎那个决议. 10. 形容词worth构成的词组作定语时,常常后置.例如： In 1626 the island of Manhattan was bought from local Indians , Natives Americans , for a handful of goods worth $24 . 曼哈顿岛是于1626年从当地的印第安人（即美洲土著人）手中买来的,只花了价值约为24美元的为数不多的货物. A car worth $ 80,000 is not too dear for him to buy . 对他来讲,买一辆价值八万美元的车不算太贵.（划线部分相当于which / that is worth $ 8,000） The tall building worth 200,000 dollars in all has been sold to a foreigner . 总计达20万美元的高楼已经卖给了一位外国人. 11.动词不定式作后置定语表示要做的事（尚未发生）,常与名词有动宾关系,不及物动词加介词. 应注意： 1. 表示将要发生的动作,有时根据句意需要加上介词,这时介词不能省略,因为被修饰的名词是它的宾语. 例The farmers thought of ways to protect their crops. We have only a small cold room to live in. 2. 用于修饰被序数词、最高级或no, all, any等限定的中心词. 例 Marie Curie became the first woman in France to be a university professor. She was the first person in the word to receive two Nobel Prize. He was the best man to do the job. 3. 根据不同的句意,不定式可用主动语态或被动语态. 例 Have you got anything to post? (post的动作执行者是“你”) Have you got anything to be posted?(post的动作执行者是“我”或“别人”) There are some plates to wash (to be washed).