单项选择题

Mr. White ______ in our school for 30 years.

A．taught
B．teach
C．had taught
D．has taught
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单项选择题
The boy is learning ______ at Cambridge University.
A．economy
B．economic
C．economist
D．economics
单项选择题
Never for a moment ______ that we would encounter so many problems.
A．I did imagine
B．did I imagine
C．I imagined
D．had I imagine
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