单项选择题

The sun will burn you ______ you' re not careful.

A．if
B．and
C．but
D．unless
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单项选择题
Your dress doesn' t _____ with your new hairstyle.
A．suit
B．mix
C．match
D．compare
单项选择题
It' s high time we ______ something to stop road accidents.
A．did
B．are doing
C．will do
D．do
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