题目内容

— The floor is clean and dry now. Who _______?
— Sorry, I don’t know.
A．mopped it upB．has mopped it upC．has mopped up itD．mopped up it
B
从题意来讲，本题需要的是现在完成时，而mop ..up 为动词+adv词组，若宾语为人称代词时，位于中间，故选B
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