单项选择题

Tom told Mary that he ______ a mistake.

A． makes
B． made
C． had made
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单项选择题
We all enjoyed ______ on the farm.
A． works
B． working
C． work
单项选择题
I know something about Kunming. I ______ there many times.
A． have gone
B． have been
C． went
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