The room is so clean. He must __________ the cleaning before he left.
A、 do
B、 have done
C、 did
D、 be done
【正确答案】：B
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The room is so clean. He must __________ the cleaning before he left.
A、 do
B、 have done
C、 did
D、 be done
【正确答案】：B
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