单项选择题

There is no knowing（）may happen in that case.

A．which
B．that
C．who
D．what

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单项选择题
（）misunderstanding can prevent you from helping each other more.

A．Nothing but
B．Anything but
C．But for
D．Rather than
单项选择题
Pluto goes around the sun once in 248 years, if we（）the earth's year（）. a standard.

A．take; as
B．take; for
C．take; in
D．take up; for
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