单项选择题

We can not see things very clearly ______ the fog.

A．because
B．as
C．by
D．in
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单项选择题
Exercise is good ______ the health, the teacher is very good ______ these children.
A．for, to
B．at, at
C．to, for
D．with, with
单项选择题
His carelessness resulted ______ his failure and your success resulted ______ your hard work.
A．in, from
B．in, in
C．from, from
D．from, in
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