Unless ____A_____ to answer question,theUnless ____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
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![Unless ____A_____ to answer question,theUnless ____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](/uploads/image/z/8554951-55-1.jpg?t=Unless+____A_____+to+answer+question%2CtheUnless+____A_____+to+answer+question%2Cthe+students+were+not+supposed+to+talk+in+Professor+Brown%27s+class.A.asked+B.being+asked+C.asking+D.having+asked%E4%B8%BA%E4%BB%80%E4%B9%88%E9%80%89A%2C%E4%BB%80%E4%B9%88%E6%97%B6%E5%80%99%E7%94%A8B)
Unless ____A_____ to answer question,theUnless ____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
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,theUnless ____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.)