She has no idea of what the book is about. She ____ have read it carefully. <br />A.mustn’t<br>B.can.t<br>C.shouldn.t<br>D.needn.t

She has no idea of what the book is about. She ____ have read it carefully.
A.mustn’t
B.can.t
C.shouldn.t
D.needn.t

出自：国家开放大学英语语法

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