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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单项选择题
______, he doesn't study well.
A．As clever is he
B．He is as clever
C．Clever as he is
D．As clever he is
单项选择题
In this restaurant, there are not enough waiters to wait ______ customers.
A．on
B．for
C．with
D．to
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