单项选择题

You should never ______ your promise to a child.

A．go back on
B．go after
C．go in for
D．go over
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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
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
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