单项选择题

I didn't know ______ at the meeting yesterday.

A． what to say
B． to say what
C． why to say
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单项选择题
—______ house is that —It's mine.
A． Who
B． Whom
C． Whose
单项选择题
You'd better go downstairs and tell the children ______ make so much noise.
A． not to
B． don't
C． to not
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