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
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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
单项选择题
I wish I ______ longer this morning, but I had to get up and come to class.
A．could have slept
B．might have slept
C．slept
D．have slept
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