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
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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
单项选择题
Acute hearing helps most animals sense the approach of thunderstorms long before people __________.
A．do
B．hear
C．do them
D．hearing it
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