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
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单项选择题
This radio is not working. I'll have it______.
A．repairing
B．to repair
C．repaired
D．be repaired
单项选择题
--Where is John --He has been busy ______ his homework.
A．to do
B．doing
C．do
D．done
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