--- Why? Tom, your shirt is so dirty!
--- Mum, I ______ my storeroom downstairs.
A．cleanedB．have cleaned
C．was cleaningD．have been cleaning
D
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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