单项选择题

Linda was doing her homework ______ her brother was watching TV.

A． while
B． when
C． that
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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
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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