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My English-Chinese

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My English-Chinese dictionary has disappeared.Who ____ have taken it? A.should B.must C.could D.would
解题思路: 情态动词
解题过程:
My English-Chinese dictionary has disappeared.Who ____ have taken it?
A. should B.must C.could D.would
句意:我的汉语词典不见了,谁会拿走它呢?
解题:考查情态动词的特殊用法。表示“推断、判断”的can,may,must
  ①在肯定句中都可以用来表示可能。在含义上must语气最为肯定,may表示的是事实上的可能性:
  Peter______come with us tonight, but he isn’t very sure yet.
  A.must B.may C.can D.will
  ②在否定句中只能用can和may。此时can’t用以代替mustn’t,语气比may not更强。can’t中文可以翻译为“不可能”、may not中文可以翻译为“可能不”。
  Michael______be a policeman, for he’s much too short.
  A.needn’t B.can’t C.should D.may
  ③在疑问句只能用can,不能用may和must
  He may be very busy now.
  Can he be very busy now?
  He must be very busy now.
Can he be very busy now?
本题是对过去的情况的猜测之后的提问,应该用could.答案是:C.could
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最终答案:略