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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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
单项选择题
--Do you think it will snow tomorrow -- ______.
A．Yes, I think it
B．I'm afraid so
C．I don't believe
D．I don't hope so
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