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

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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
单项选择题
The boy's father bought him a large toy train（）

A. to play with
B. to play with it
C. which to play with
D. at which to play
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