单项选择题

Many a teacher in our department ______ abroad.

A．have been
B．has been
C．have go
D．has go
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单项选择题
Every person's usual temperature varies ______ the time of days.
A．from
B．in
C．to
D．with
单项选择题
But for your help, I ______ my work yesterday.
A．can't finish
B．wasn't able to finish
C．couldn't finish
D．couldn't have finished
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