单项选择题

_____you’’ re early you can’’t be sure of getting a seat.

A．If
B．Unless
C．When
D．Because
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单项选择题
All the arrangements should have been completed prior________ our departure.
A．in
B．to
C．by
D．before
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
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