单项选择题

It's time ______ about the traffic problem downtown.

A．something was done
B．anything will be done
C．everything is done
D．nothing to be done
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单项选择题
It is said that he ______ murder.
A．committed
B．conducted
C．executed
D．emitted
单项选择题
It is no use ______.
A．to buy books and not to read them
B．buying books and not to read them
C．buying books and not reading them
D．to buy books and not reading them
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