单项选择题

You may leave the jelly in a cool place to ______ it.

A．harden
B．soften
C．sharpen
D．strengthen
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单项选择题
His ______ led to the resolution of all our difficulties.
A．general
B．generosity
C．generation
D．generalization
单项选择题
He ______ his failure to bad luck.
A．prescribed
B．ascribed
C．described
D．scribe
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