单项选择题

So long as we put our heads together, I'm sure that we will certainly find a(n) ______ to the problem.

A．approach
B．key
C．answer
D．solution
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单项选择题
If you have chance to go to China, you must take some pictures of the Great Wall for it ______ the country' s civilization.
A．symbolizes
B．sponsors
C．utters
D．pioneers
单项选择题
______come out of the building, my first thought was to call the fire department.
A．On seeing the smoke
B．When I saw the smoke
C．Having seen the smoke
D．As soon as the smoke was seen
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