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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单项选择题
Coffee ______ milk Milk ______ no sugar, thank you.
A． and... but
B． or... and
C． or... but
单项选择题
The teacher told me ______ to use computers.
A． which
B． how
C． what
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