单项选择题

I'm sorry to have kept you______.

A． wait
B． to wait
C． waiting
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单项选择题
Do you know how many students took part ______ the school sports meet yesterday
A． on
B． in
C． of
单项选择题
Is that Mrs. Black speaking Yes, ______
A． Who is that
B． Who is it
C． Who are you
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