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—— Why? Tom, your shirt is so dirty!
—— Mum, I ＿＿＿＿＿ my storeroom downstairs。
A．cleanedB．have worked C．was cleaningD．have been cleaning
D
現(xiàn)在完成進(jìn)行時表示從過去某時到現(xiàn)在一直在進(jìn)行的動作。
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