The worsening of global warming human activities are to blame has led to frequently extr

问题补充：

The worsening of global warming, human activities are to blame, has led to frequently extreme weather.

A. by which

B. for which

C. that

D. what

答案：

A. by which

(答案→)B. for which

C. that

D. what

解析：blame后面接宾语需要加介词for,故选B.

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