单项选择题

It was not until it got dark______working.

A．that they stopped
B．when they stopped
C．did they stop
D．that they didn't stop
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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
单项选择题
I suppose you are not serious, ______
A．do I
B．don't I
C．are you
D．aren't you
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