单项选择题

Someone broke into the house and stole many paintings. It was a long time ______ the housekeeper discovered what had happened.

A．until
B．when
C．since
D．before
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单项选择题
Details of the scheme have not yet been ______ to the public.
A．released
B．relieved
C．relief
D．related
单项选择题
Advertising is distinguished from other forms of communication ______ the advertiser pays for the message to be delivered.
A．in that
B．in which
C．in order that
D．in the way
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