The classroom is in a mess. It______ (肯定没打扫过).can’t have been cleaned.本题考查对肯定猜测句

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问题 The classroom is in a mess. It______ (肯定没打扫过).

选项

答案 can’t have been cleaned.

解析本题考查对肯定猜测句型的翻译。“情态动词+have done”表示推测，must／can／may／might／could各用于不同句型中，must只用于肯定句中，can／could不能用于肯定句中，may／might不能用于疑问句中。can’t表示“不可能”，may not表示“可能不”。如题中推测的为过去发生的事情，情态动词后则用完成形式。

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