单项选择题

The students have no difficulty ______ the exercise.

A．in doing
B．to do
C．with
D．doing
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单项选择题
When I was a child I ______ go swimming in the lake.
A．used to
B．am used to
C．use to
D．was used
单项选择题
______ is a great virtue.
A．The wisdom
B．Wisdom
C．Wisdoms
D．A wisdom
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