单项选择题

She helped the old man ______ the car.

A．into
B．on
C．in
D．to
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单项选择题
The experiment ______ the discovery of a cure for cancer.
A．happened to
B．led up
C．resulted in
D．set up
单项选择题
That young boy was knocked ______ by a passing car.
A．on
B．at
C．in
D．down
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