单项选择题

We wouldn't lose heart even if we ______ again.

A．would fail
B．failed
C．had failed
D．fail
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单项选择题
Let' s think of a situation ______ this idiom can be used.
A．where
B．which
C．that
D．what
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
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