【題目】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:清潔工們已經(jīng)打掃完了街道,現(xiàn)在它很干凈了。are sweeping正在打掃;will sweep將會打掃;have swept已經(jīng)打掃完;swept過去式。根據(jù)句意and it is quite clean now可知,已經(jīng)打掃完了。CD的區(qū)別在于:現(xiàn)在完成時側(cè)重過去的動作對現(xiàn)在的影響;一般過去時只表示過去發(fā)生的事情,與現(xiàn)在無關(guān)。

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