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
You will fall behind if you ______ hard.
A．didn't work
B．won't work
C．don't work
单项选择题
Coffee ______ milk Milk ______ no sugar, thank you.
A．and... but
B．or... and
C．or... but
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