单项选择题

They left at nine, so they ______ by now.

A. may arrive


B. must arrive
C. should have arrived

D. ought to arrive
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单项选择题
A suitcase with shirt, trousers and shoes ______ stolen from the car.
A. have been
B. has been
C. are

D. was
单项选择题
______ both sides accept the agreement ______ a lasting peace be established in this region.
A. Should, will


B. Unless, would
C. Only if, will


D. If only, would
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