单项选择题

He said that the driver must have had an accident; otherwise he ______ by then.

[A] would have arrived
[B] must have arrived
[C] should arrive
[D] would arrive
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单项选择题
John's score on the test is the highest in the class; he ______ last night.
[A] must study
[B] should have studied
[C] must have studied
[D] is sure to study
单项选择题
You cannot be ______ careful when you drive a car.
[A] very
[B] so
[C] too
[D] enough
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