单项选择题

He acted as though nothing ______.

A．was happening
B．had happened
C．has happened
D．happened
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单项选择题
Such electronic devices ______ are used in a radio set can also be found in a computer.
A．in which
B．that
C．which
D．as
单项选择题
If the earth suddenly ______ spinning, we would all fly off it.
A．stopped
B．had stopped
C．has stopped
D．would stop
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