She has no idea of what the book is about. She________have read it carefully.

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问题 She has no idea of what the book is about. She________have read it carefully.

选项 A、mustn’t
B、can’t
C、shouldn’t
D、needn’t

答案B

解析 本题考查对过去发生事情的推断。mustn’t have done无此用法;can’t have done“不可能做过”;shouldn’t have done“不应该已做过”;needn’t have done“本不必做”。根据句意,故选B。
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