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
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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
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.)

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 not negotiable unless consigned to order 翻译：non-negotiable unless consigned to order not negotiable unless consigned to order unless they happen to know the chinese custom 翻译 Unless they happen to know the Chinese customs. We don't dare to say a word unless she asks us to.unless引导了什么样的从句? I’m afraid I can’t finish the work____________ to help me.A.unless you will comeB.unless you co I’m afraid I can’t finish the work____________ to help me.A.unless you will come B.unless you we dont dare to say a word unless she asks us to 为啥有to Forgot to tell you,I want to give up,unless it is farting.翻译 Victory won’t come to me unless I go to it.有什么情态在里面 Victory won't come to me unless I go to it.帮忙翻译下,紧急, victory wont come to me unless i go to it 是谁说的? “Victory won't come to me unless I go to it” 的中文意思 victory won't come to me unless i go to it vicotory won't come to me unless i go to it翻译中文 Victory won't come to us unless we go to it!--M.Moore