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【题目】The cleaners ______ the street and it is quite clean now.

A. are sweeping B. will sweep C. have swept D. swept

【答案】C

【解析】句意:清洁工们已经打扫完了街道,现在它很干净了。are sweeping正在打扫;will sweep将会打扫;have swept已经打扫完;swept过去式。根据句意and it is quite clean now可知,已经打扫完了。CD的区别在于:现在完成时侧重过去的动作对现在的影响;一般过去时只表示过去发生的事情,与现在无关。

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