.—— Why? Tom, your shirt is so dirty!

—— Mum, I ＿＿＿＿＿ my storeroom downstairs。

A.cleaned     B.have worked

C.was cleaning     D.have been cleaning

D


解析:

現(xiàn)在完成進(jìn)行時(shí)表示從過(guò)去某時(shí)到現(xiàn)在一直在進(jìn)行的動(dòng)作。

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