1、-May I go out now? -No.You ( ) let your mother know first.

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1、-May I go out now? -No.You ( ) let your mother know first. A.may B.can C.need D.must
2、Be quiet,please,and your voice ( ) be heard.
A.may B.mustn't C.shouldn't D.can
说明理由,急

1.D 你必须先让你妈妈知道.
2.C 让他安静,所以说你的声音不应该被听到.
再问：第2题为什么不能选B
再答：如下面那个讲的~我copy来了。 mustn't是不准，不许，表示一种命令，条规

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