题目内容
—Why? Tom, your shirt is so dirty!
—Mum, I______my storeroom downstairs.
A. cleaned B. have cleaned
C. was cleaning D. have been cleaning
【解析】选D。“我一直在楼下打扫储藏室”,应用现在完成进行时。

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题目内容
—Why? Tom, your shirt is so dirty!
—Mum, I______my storeroom downstairs.
A. cleaned B. have cleaned
C. was cleaning D. have been cleaning
【解析】选D。“我一直在楼下打扫储藏室”,应用现在完成进行时。