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
______ we have all the materials ready, we should begin the new task at once.
A．Since that
B．Since now
C．By now
D．Now that
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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