.-- Why? Tom, your shirt is so dirty! -- Mum, I ＿＿＿＿＿ my storeroom downstairs. A.cleaned B.have worked C.was cleaning D.have been cleaning 题目和参考答案——青夏教育精英家教网—

题目内容

.—— Why? Tom, your shirt is so dirty!

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

A.cleaned B.have worked

C.was cleaning D.have been cleaning

解析:

现在完成进行时表示从过去某时到现在一直在进行的动作。

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