单项选择题

Great ( ) the difficulties are, we must do our best to succeed.

A．while
B．as
C．although
D．however
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单项选择题
It’s high time ( ) about the traffic problem.
A．something was done
B．something is done
C．anything will be done
D．nothing to be done
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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