The teacher advised his students that in the presence og the

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The teacher advised his students that in the presence og the visiting mayor they should not say anything unless___
A.being asked B.asked C.to be asked D.having been asked
可是我想知道为什么?还有为什么不能选C?不是被动态吗...
单词打错了,请把"og"改成"of"
为什么在这种情况下ask就做非谓语了?能通俗简单地说下,非谓语一般是用在什么情况下的吗?勿复制.

因为unless引导的从句中没有主语,谓语动词一定要同主语连用,所以没有主语就用非谓语动词了!一般是动词ing和动词ed形式,反正你记住：如果一个动词前没有主语,那么肯定就用非谓语形式了!
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先给你举个例子：We will answer the questions if _.只要填出这个空你的问题就迎刃而解了,这里实际上是if引导的条件状语,后面可以用doing或done的非谓语形式,这是状语从句的规定,如果用to be done就多此一举了!同样unless引导的条件状语也是同样的道理.（刚刚看错题目了,对不起!）既然你是上海的,若还不懂,你可以参考复旦大学的那本语法实践指南中非谓语中的过去分词那部分内容.

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