单项选择题

A curve is a line ______ no part is straight and which has no angle.

A．that
B．whose
C．in which
D．of which
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单项选择题
______I saw was two men crossing the street.
A．What
B．Whom
C．Who
D．That
单项选择题
I don't like to disturb you, because you're quite tired ______ working hard today.
A．of
B．with
C．out
D．on
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