单项选择题

We think it necessary to prevent sound ( ), as it is getting more and more serious.

A、condition
B、invention
C、pollution
D、position
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单项选择题
Mother bought( )last week.
A、three dozen eggs
B、dozens eggs
C、dozen of eggs
D、three dozens eggs
单项选择题
In putting the picture into the envelope, ( )
A、it tore
B、it was torn
C、I have it torn
D、I tore it
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