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

They've decided to freeze the（）at last year's level.

A. grand
B. grind
C. ground
D. grant

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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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