单项选择题

The mayor of Shanghai says that all construction work for the World Expo (世博会) ______ by 2009.

A. has been complete
B. has completed
C. will have been completed
D. will have completed
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单项选择题
______ in the queue for half an hour, Tom suddenly realized that he had left his wallet at home.
A. To wait
B. Waiting
C. Having waited
D. To have waited
单项选择题
John got the first prize in the Math contest, ______ made his parents very happy.
A. what
B. which
C. that
D. this
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