单项选择题

Today the police can watch cars______on roads by radar.

A．run
B．to run
C．running
D．to be run
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单项选择题
Before the child went to bed, the father asked him to______all the toys he had taken out.
A．put off
B．put up
C．put away
D．put out
单项选择题
Helen was much kinder to her youngest child than she was to the others, ______, of course, made the others jealous.
A．who
B．what
C．that
D．which
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