单项选择题

All the arrangements should have been completed prior________ our departure.

A．in
B．to
C．by
D．before
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单项选择题
Neither John nor I________ able to persuade Richard’’s grandfather to attend the wedding.
A．am
B．are
C．are to be
D．is
单项选择题
______is well-known, the environment in China is badly in need of improvement.
A．It
B．That
C．As
D．What
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