单项选择题

The new washing machines are __ at the rate of fifty a day.

A. turned up
B. tnmed down
C. turned out
D. turned in
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单项选择题
By cutting down trees we __ the natural home of birds and animals.
A. harm
B. hurt
C. injure
D. damage
单项选择题
A man escaped from the prison last night. It was a long time ______ the guards discovered what had happened.
A. before
B. until
C. since
D. when
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