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
Those were the graduate students ______ to do the research work in the lab.
A．to whom it was their responsibility
B．of whom the function was
C．whose responsibility was
D．of whom with the responsibility
单项选择题
These people once had fame and fortune; now______ is left to them is utter poverty.
A．all that
B．all what
C．all which
D．that all
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