Unless A_ to answer question,the

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/29 12:24:57

Unless ____A_____ to answer question,the
Unless ____A_____ to answer question,the students were not supposed to talk in Professor Brown's class.
A.asked B.being asked C.asking D.having asked
为什么选A,什么时候用B

这里用过去分词表示被动,强调学生们在被问到的时候才可以讲话.所以选择A.
选B的话,是用现在分词表示条件,需要描述学生主动的动作.如：
When asking the questions,the students were supposed to talk in Professor Brown's class.
(这个例句不是非常english,但是为了和原句有个比较,造了一个这样的句子,但是平时描述会用其他的方式,如：Before asking the questions,the students should raise their hands.都是现在分词表主动用法.)

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