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
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单项选择题
That young boy was knocked ______ by a passing car.
A．on
B．at
C．in
D．down
单项选择题
______ I accept that he is not perfect, I do actually like the person.
A．Since
B．While
C．Before
D．Unless
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