单项选择题

Perhaps you ______ leave now. Your friend may be waiting for you outside.

A．must
B．could
C．should
D．will
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单项选择题
When we met Mr. Smith last year, he ______ in that school for ten years.
A．taught
B．was teaching
C．had taught
D．would teach
单项选择题
This radio is not working. I'll have it______.
A．repairing
B．to repair
C．repaired
D．be repaired
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