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Discussion of greenhouse effects have usually had as a focus the possibility of Earth growing warmer and to what extent it might, but climatologists have indicated all along that precipitation, storminess, and temperature extremes are likely to have the greatest impact on people.
A
Discussion of greenhouse effects have usually had as a focus the possibility of Earth growing warmer and to what extent it might,
B
Discussion of greenhouse effects has usually had as its focus whether Earth would get warmer and what the extent would be,
C
Discussion of greenhouse effects has usually focused on whether Earth would grow warmer and to what extent,
D
The discussion of greenhouse effects have usually focused on the possibility of Earth getting warmer and to what extent it might,
E
The discussion of greenhouse effects has usually focused on whether Earth would grow warmer and the extent that is,
【申友解析】
解析：正确答案C
A 主谓不一致，应该用has，过去完成时错误。
B has usually had as its focus表达冗长。
C正确
D 主谓不一致，应该用has，且and两边不平行。
E that is 无指代，错误。
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