单项选择题

The real trouble ______ their lack of confidence in their faculty.

A．lies in
B．results in
C．leads to
D．brings about
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单项选择题
He did it ______ gratitude for everything She had done for him.
A．with
B．in
C．with regard to
D．out of
单项选择题
Let' s think of a situation ______ this idiom can be used.
A．where
B．which
C．that
D．what
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