单项选择题

I know the city well because I ______ there several times.

[A] go
[B] am
[C] have gone
[D] have been
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Now that we've worked out the plan, we must put it into ______ as soon as possible.
[A] fact
[B] reality
[C] practice
[D] deed
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We were watching TV together ______ a stranger came in.
[A] while
[B] when
[C] that
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