单项选择题

It is necessary that everyone ______ a copy of this book.

A) has
B) could have
C) will have
D) should have
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In this restaurant, there are not enough waiters to wait ______ customers.
A) on
B) for
C) with
D) to
单项选择题
You should learn to take ______ of every opportunity to improve your oral English.
A) chance
B) use
C) action
D) advantage
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