题目内容

To make our city more beautiful, rubbish ________ into the river.


  1. A.
    needn't be thrown
  2. B.
    mustn't be thrown
  3. C.
    can't throw
  4. D.
    may not throw
B
解析:
剖析:这是含有情态动词的被动语态。首先应排除C和D,因为它们是主动语态;
含有情态动词的被动语态的构成应该是:“情态动词+be+及物动词的过去分词”,needn't是“不必”=don't have to;
mustn't是“禁止,不准”之意,故选B。
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