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
答案:D
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题目内容
-Why? Tom, your shirt is so dirty!
-Mum. I ________ my storeroom downstairs.
[ ]