单项选择题

The 19th century ______the development of industry.

A) witnesses
B) is witnessing
C) witnessed
D) have witnessed
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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
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
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