题目内容

The global warming is more and more serious，for which human beings ________.
A．are blamingB．are to blame
C．are going to blameD．are to be blamed
B

be to blame用主动形式表示被动含义，表示“应该受责备”。句意为：全球变暖越来越严重，在这个问题上人类应该受到责备。
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