问题补充：
The global warming is more and more serious, for which human beings ．
A. are blaming
B. are to blame
C. are going to blame
D. are to be blamed
答案：
A. are blaming
(答案→)B. are to blame
C. are going to blame
D. are to be blamed
解析：考查短语。be to blame for 应受到责备。句意：全球变暖变得越来越严重了，人类应对此负责。
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