单项选择题

She didn't realize it was too late to go home ______ it grew dark.

A．while
B．since
C．until
D．after
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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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