单项选择题

You never told us his phone number，______

A．hadn’t you
B．didn’t you
C．had you
D．did you
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单项选择题
The smoke from that factory is ______ our air to a dangerous degree．
A．destroying
B．spoiling
C．polluting
D．damaging
单项选择题
It’s high time ______ about the traffic problem．
A．something was done
B．everything is done
C．anything will be done
D．nothing to be done
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