单项选择题
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A.It would do him good to go out for a while.
B.He ought to do the first ten problems again.
C.She could help him with the problems.
D.He should be finished with the problems by two.
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单项选择题
A.Operate metal detectors.B.Require each passenger to show photo identification.C.Make a body search by hand.D.Operate X-ray machines to screen baggage.
A.Operate metal detectors.
B.Require each passenger to show photo identification.
C.Make a body search by hand.
D.Operate X-ray machines to screen baggage.
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单项选择题
A.A popular television program.B.A breakthrough in technology.C.A recent purchase.D.A new electronic store.
A.A popular television program.
B.A breakthrough in technology.
C.A recent purchase.
D.A new electronic store.
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