单项选择题

I believe there must be a _______ explanation for these strange happenings, which has made us restless all these days.

A．physical
B．mental
C．practical
D．natural
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单项选择题
Tom and his dog ______ were here a moment ago have disappeared.
A．that
B．who
C．which
D．those
单项选择题
We adopted the new methods with a view to _______ our efficiency.
A．raise
B．raising
C．rise
D．rising
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