单项选择题

The scientists are trying to find out the facts to ______ their theory.

A．support
B．carry
C．design
D．raise
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单项选择题
Interestingly enough, the two brothers have noting in ______.
A．ordinary
B．common
C．general
D．particular
单项选择题
He will never forget the days ______ he spent in Japan.
A．when
B．after
C．that
D．how
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