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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单项选择题

They decided to chase the cattle away（）it did more damage.

A. unless
B. until
C. before
D. although

单项选择题

（）in the earthquake thoroughly, the city has now rebuilt.

A. Destroying
B. Having destroyed
C. Destroyed
D. To be destroyed

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