单项选择题

Do help yourself to some fruit,__________ you

A．can't
B．don't
C．wouldn't
D．won't
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单项选择题
The central provinces have floods in some years, and __________.
A．drought in others
B．droughts are others
C．while other droughts
D．others in drought
单项选择题
This is an illness that can result in total blindness __________ left untreated.
A．after
B．if
C．since
D．unless
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