单项选择题

It must have rained yesterday evening, ______ the ground is wet.

A．since
B．while
C．for
D．because
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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
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
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