单项选择题

—Why Tom, your shirt is so dirty!
—Mum, I （） my storeroom downstairs.

A. cleaned
B. have worked
C. was cleaning
D. have been cleaning

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单项选择题
Look at this ! I （）some magazines and （） this letter.

A. was looking through; found
B. am looking through; find
C. looked through; had found
D. had looked through; finding
单项选择题
—Alice came back home the day before yesterday. —Really Where ______
A. has she been
B. had she been
C. has she gone
D. had she gone
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