单项选择题

The price of seafood used to be much lower than now, ______

A．wasn't there
B．wasn't it
C．doesn't it
D．didn't it
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单项选择题
For many patients, institutional care is the most _______ and beneficial form of care.
A．pertinent
B．appropriate
C．acute
D．persistent
单项选择题
The staff, having finished work for the day, ______ going home now.
A．is
B．are
C．was
D．were
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