2. 外语
  3. The room is in a terrible mess; it ______ cleaned.

The room is in a terrible mess; it ______ cleaned.

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问题 The room is in a terrible mess; it ______ cleaned.
选项 A、mustn’t have been
B、shouldn’t have been
C、can’t have been
D、wouldn’t have been
答案C
解析 对过去否定的推测用“can’t have+过去分词”。
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