— 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
從題意來(lái)講，本題需要的是現(xiàn)在完成時(shí)，而mop ..up 為動(dòng)詞+adv詞組，若賓語(yǔ)為人稱代詞時(shí)，位于中間，故選B
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