单项选择题

I was listening to the music ______ there was a knock at the door.

A．when
B．while
C．because
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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
Please give me ______.
A．two cups of milks
B．two cup of milk
C．two cups of milk
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