问题

Tom, your shirt is so dirty!— Mum, I _____ my storeroom downstairs。

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

正确答案是：

同类题型

5．Theco________ good at playing table tennis.

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The rain ________ fast and heavy.—You should ________ some shelterLook at you—you are all wet

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