问题补充:
--Must I renew the book now?
--No, you . You that before the deadline.
A. mustn ; should do
B. needn’t; should have done
C. may not; should do
D. can ; should have done
答案:
A. mustn ; should do
B. needn’t; should have done
C. may not; should do
(答案→)D. can ; should have done
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