—— Why? Tom, your shirt is so dirty! —— Mum, I ＿＿＿＿＿ my storeroom downstairs。 A. cleaned B. have wor...
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题目内容：
—— 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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