单项选择题

The boy is learning ______ at Cambridge University.

A．economy
B．economic
C．economist
D．economics

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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

单项选择题

We ve been waiting here for over an hour, and ______.

A．have all these other people either
B．all these other people either
C．so have all these other people
D．so all these other people have

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