单项选择题

______ to the sun, rain and wind for a long time, the stone split.

A．Expose
B．Exposed
C．Exposing
D．To expose
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单项选择题
______, the design is useless.
A．To speak practical
B．Speaking practical
C．Practically speaking
D．In speaking practical
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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