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
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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
单项选择题
______ is known to the world, Beethoven is a great musician.
A. That
B. Which
C. As
D. It
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