单项选择题

You'd better let me know as soon as there is a(n) ______ position in the branch office.

A．empty
B．vacuum
C．hollow
D．vacant
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单项选择题
Even if his letter ______ tomorrow, it ______ too late to do anything.
A．will arrive.., is
B．should arrive.., were
C．arrives.., will be
D．arrives.., would be
单项选择题
After a careful investigation, the committee decided to ______ the old hall.
A．change
B．build
C．innovate
D．renovate
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