单项选择题

Very few scientists ______ completely new answers to the world's problems.

A．come up with
B．come out
C．come round
D．come up to
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单项选择题
You may borrow the book, ______ that you do not lend it to anyone else.
A．on occasion
B．on condition
C．on purpose
D．only if
单项选择题
How is it ______ your roommate's request and yours are identical
A．if
B．so
C．what
D．that
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