单项选择题

The protection device can eliminate the faults _______ they cause more damage.

A．unless
B．until
C．before
D．although
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单项选择题
He is too weak to _______ his business.
A．do with
B．do without
C．do away with
D．do up
单项选择题
Water is to fish _______ air is to man.
A．that
B．which
C．what
D．how
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