The room is in a terrible mess; it ______ cleaned.A、mustn’t have beenB、shouldn’

游客2024-07-02 18

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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