单项选择题

It ______ be Mr. Green. I know he went to Shanghai yesterday.

A． mustn't
B． can't
C． may not
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单项选择题
I don't know what happened. I didn't do ______.
A． everything
B． anything
C． one thing
单项选择题
My car broke down this morning, so I went to work ______ foot.
A． by
B． in
C． on
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