单项选择题

______ arriving at the meeting room, Tina discovered that she had left the sample products in her office.

A．By
B．Through
C．On
D．In
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Not until yesterday ______ anything about the new advertising campaign.
A．I learned
B．have I learned
C．did I learn
D．that I learned
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
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