单项选择题

______ I'm mistaken, I've seen that man before.

A．Unless
B．If
C．Because
D．Provided
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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
单项选择题
______I saw was two men crossing the street.
A．What
B．Whom
C．Who
D．That
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