单项选择题

I don't know what happened. I didn't do ______.

A． everything
B． anything
C． one thing
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单项选择题
My car broke down this morning, so I went to work ______ foot.
A． by
B． in
C． on
单项选择题
Look! The man ______ to my teacher is my father.
A． talks
B． to talk
C． talking
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