--- Why? Tom, your shirt is so dirty!

    --- Mum, I ______ my storeroom downstairs.

    A. cleaned                   B. have cleaned

    C. was cleaning              D. have been cleaning

D


解析:

由上下文語(yǔ)境推出一直在做某事，同時(shí)對(duì)現(xiàn)在產(chǎn)生影響，襯衫臟。

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