单项选择题

__________ is often the case, workers have over fulfilled their work program.

A．Which
B．It
C．That
D．As
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单项选择题
When I was younger I __________ long distance, but now I’m out of practice.
A．was used to walk
B．got used to walk
C．was used to walking
D．used to walking
单项选择题
Something is wrong with your truck. You’d better have it __________.
A．repairing
B．repair
C．repaired
D．to be repaired
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