单项选择题

If you carefully ______ the problem again, you will find a way out.

A．think over
B．set up
C．take over
D．look up
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单项选择题
We hope that such a book ______ is helpful is on sale now.
A．that
B．which
C．as
D．what
单项选择题
He ______ the news on the radio. You needn't go to tell him.
A．learns
B．is learning
C．had learned
D．has learned
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