Question

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

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

Answer 1

【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。C和D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。