单项选择题

Lucy knew nothing about it ______ her sister told her.

A．because
B．until
C．since
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单项选择题
Tom has been in the factory ______ he left school.
A．when
B．as soon as
C．since
单项选择题
He has searched his bag ______ 2 hours for his picture.
A．for
B．with
C．in
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