单项选择题

______ the 2012 Olympic Games will be held in London is not known yet.

A. Whether
B. If
C. Whenever
D. That
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单项选择题
Showing some sense of humor can be a(n) ______ way to deal with some stressful situation
A. effective
B. efficient
C. favorable
D. favorite
单项选择题
______ I admit that the problems are difficult, I don't agree that they cannot be solved.
A. When
B. Where
C. While
D. Why
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