单项选择题

The workers ______ a library for our university this month.

A．are building
B．built
C．build
D．had built
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单项选择题
If Jane had taken more exercises in the past few years, she ______ so fat now.
A．would be
B．wouldn't have been
C．wouldn't be
D．would have been
单项选择题
______ Cathy lives is unknown to everyone.
A．That
B．Which
C．What
D．Where
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