求助两道英语选择题1.I 'm very glad to know that my boss has generousl

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求助两道英语选择题
1.I 'm very glad to know that my boss has generously agreed to __write off__ my debt in return for certain services.
A take away B cut out C write off D clear up
2.Mr.Jones _attened__ the conference in Tokyo last year.
A attened B participated C presented D took part
两题答案已经知道,想知道其他选项的意思,为什么不适用,还有 certain services是什么意思?谢谢了

take away 减去,拿走 cut out 切去,删去,戒除,停用 clear up 打扫清理澄清固定搭配：write off one's debt 与某人一笔勾销,注销某人债务
participate 参与参加但是是Vi后面要加in ; present 表出现的含义是形容词,要用be present at结构 take part 表参加含义时同样是Vi后面要加in
certain service 是特定服务的意思,至于具体什么服务,这里没说o(∩_∩)o

求助两道英语选择题1.I 'm very glad to know that my boss has generousl it has eached at me.i am very glad to know that（改错题） 2)it has eached at me.i am very glad to know that 改错题 I'm glad to know 英语短文改错 dear li hua ,i'm glad to know that you have accustome I,M very glad to see that Beijing is beco 英语短文改错Dear Mr Smith,I'm very much glad to hear that your int I\'m very glad to meet I'm very glad to be have 高一英语改错题1.I'm very glad to received your letter,mentioning ou I'm very glad to see you,I_____(not know）you had come alread 英语翻译Hello,I'm very glad to introduce myself to you!My name i