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

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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