单项选择题

The World Exposition Center ______ by the end of 2010, will attract over 70 million people.

A．completed
B．being completed
C．to be completed
D．having been completed
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单项选择题
When Jack arrived he learned Mary ______ for almost an hour.
A．had gone
B．had set off
C．had left
D．had been away
单项选择题
Completely new situation will ______ when the new examination system comes into existence.
A．rise
B．raise
C．arouse
D．arise
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