题目内容

【题目】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】

试题分析：句意：昨天我打扫了教室，所以今天它不脏。根据句中时间状语 yesterday可知此空应用一般过去时态，所以选B。

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