问题
选择题
— The floor is clean and dry now. Who _______?
— Sorry, I don’t know.
A．mopped it up
B．has mopped it up
C．has mopped up it
D．mopped up it
答案
答案：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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