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
Nothing but some chairs _______ in the room.
A．has found
B．had found
C．were found
D．was found
单项选择题
Advertising is distinguished from other forms of communication _______ the advertiser pays for the message to be delivered.
A．in this way
B．in that
C．in which
D．in order to
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