单项选择题

The boy is learning _____ at Cambridge University.

A．economy
B．economic
C．economist
D．economies
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单项选择题
The more you know about it, ______.
A．the more happy you are
B．you are more happy
C．the happier are you
D．the happier you are
单项选择题
Do you ______ if I stay here for a while
A．care
B．bother
C．mind
D．like
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