Unless ____A_____ to answer question,the
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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
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
![Unless ____A_____ to answer question,the](/uploads/image/z/1556576-8-6.jpg?t=Unless+____A_____+to+answer+question%2Cthe)
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.)
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.)
Unless ____A_____ to answer question,the
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