单项选择题

The supervisor didn't have time so far to go into it______ , but he gave us an idea about his plan.

A．at hand
B．in turn
C．in conclusion
D．at length
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单项选择题
After the collision, he examined the considerable______ to his car.
A．ruin
B．deficiency
C．penetration
D．innovation
单项选择题
Teaching students of threshold level is hard but the effort is very______ to all of us.
A．significant
B．rewarding
C．repayable
D．hardy
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