单项选择题

I'm reading a piece of news on the conference ______was held last week.

A) what
B) where
C) which
D) who
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单项选择题
Please stay with me a moment______--I am getting to the point of the story.
A) more
B) less
C) longer
D) shorter
单项选择题
He has been working as an engineer ______graduation.
A) while
B) as
C) since
D) which
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