问题补充：
--- Why? Tom, your shirt is so dirty!
--- Mum, I my storeroom downstairs.
A. cleaned
B. have cleaned
C. was cleaning
D. have been cleaning
答案：
A. cleaned
B. have cleaned
C. was cleaning
(答案→)D. have been cleaning
解析：由上下文语境推出一直在做某事，同时对现在产生影响，衬衫脏。
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