单项选择题

When I was a child I used ______ swimming in the lake.

A．to going
B．going
C．to go
D．go
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单项选择题
Do you think it necessary ______ an English diary every day
A．keep
B．to keep
C．keeping
D．kept
单项选择题
You know that's right, ______.
A．is it
B．isn't it
C．do you
D．don't you
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