单项选择题

The strong storm ______ all the power lines in this region.

A．knock over
B．knock out
C．knock at
D．knock up
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单项选择题
The car wants ______.
A．to maintain
B．to be maintained
C．to maintaining
D．maintaining
单项选择题
______ begins with ______.
A．Knowledge, practice
B．The knowledge, practice
C．The knowledge, the practice
D．Knowledges, practices
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