【題目】I ________ the room yesterday, so it is not dirty today.

A. clean B. cleaned

C. will clean D. is cleaning

【答案】B

【解析】

試題分析:句意:昨天我打掃了教室,所以今天它不臟。根據(jù)句中時(shí)間狀語 yesterday可知此空應(yīng)用一般過去時(shí)態(tài),所以選B。

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