____________________________ (她不可能已上交论文) for she didn’t start until yesterday. S

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问题 ____________________________ (她不可能已上交论文) for she didn’t start until yesterday.

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答案 She can’t have turned in her paper

解析 ①考查情态动词表推测的用法，can/could/may/might/must have done用于表示对过去发生的动作的主观判断，must的否定形式用can’t，不能用mustn’t。②“上交”可译作turn in。

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____________________________(她不可能已上交论文)forshedidn’tstartuntilyesterday.S