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

游客2024-05-29  10

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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