12.--- Why?Tom,your shirt is so dirty!
--- Mum,I ______ my storeroom downstairs.
A.cleaned B.have cleaned C.was cleaning D.have been cleaning
这题怎么选,为什么
人气：432 ℃ 时间：2019-10-11 19:23:23
解答
D,表示过去的那段时间一直在打扫,而且有对现在的影响
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