I Think a lot of work .....to prepare for the entrance examination . A.should be done. B.should have been done. C.should do. D.should have

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I Think a lot of work .....to prepare for the entrance examination .
A.should be done.
B.should have been done.
C.should do.
D.should have

#NOCOPY

⇒ B.should have been done.

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