单项选择题

We hope that such a book ______ is helpful is on sale now.

A．that
B．as
C．which
D．what
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单项选择题
I hoped that the book was as ______ as the one you lent me.
A．good
B．well
C．better
D．best
单项选择题
If you carefully ______ the problem again, you will find a way out.
A．think over
B．take over
C．set up
D．look up
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