单项选择题

In many parts of the world the only _______ water supply lies below the ground．

A．continuous
B．permanent
C．instant
D．constant
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单项选择题
He is determined to get _______ of the profit than he had been offered．
A．ten percent more
B．ten more percent
C．more ten percent
D．as many as ten percent
单项选择题
Tomorrow it will be cloudy, with a few sunny ______ ．
A．intervals
B．periods
C．steps
D．instance
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