He ____ writing the paper now. He hadn’t written a single word when I left him ten minutes ago.

A、shouldn’t be       B、can’t have finished    C、can’t be     D、mustn’t have finished

B 


解析:

考查情態(tài)動(dòng)詞。“can’t have + 過去分詞”表示對(duì)過去情況的可能性推測，此處意為“不可能已完成”。

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【小題1】
A．signal B．pride C．successD．expectation
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A．dormitoryB．homeC．classroomD．school
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A．whenB．unlessC．beforeD．since
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【小題19】
A．bagB．pencilC．chalkD．ball
【小題20】

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