单项选择题

Not until yesterday ______ anything about the new advertising campaign.

A．I learned
B．have I learned
C．did I learn
D．that I learned
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单项选择题
By the end of next year, I ______ for the company for 10 years.
A．work
B．am working
C．had worked
D．will have worked
单项选择题
The new employees had to go over the safety regulations several times ______ they understood them.
A．since
B．before
C．unless
D．when
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