单项选择题

______you don't know the rule won't be a sufficient excuse for your failure.

A．It is
B．That
C．Because
D．What
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单项选择题
A modern city has been set up in______was a wasteland ten years ago.
A．what
B．which
C．that
D．where
单项选择题
Some people like drinking coffee, for it has______effects.
A．promoting
B．stimulating
C．enhancing
D．encouraging
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