单项选择题

Jack（）yet, otherwise he would have telephoned me.

A. mustn't have arrived
B. shouldn't have arrived
C. can't have arrived
D. need not have arrived

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单项选择题
She ought to stop working; she has a headache because she（）too long.

A. has been reading
B. had read
C. is reading
D. read
单项选择题
If law and order（）, neither the citizen nor his property is safe.

A. are not preserved
B. is not preserved
C. were not preserved
D. have not preserved
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