【題目】_________ is generally believed, it is human activities that have contributed to the global warming.

A. It B. As C. that D. what

【答案】

【解析】

試題分析：考查定語從句。句意：人們普遍認(rèn)為，正是人類活動(dòng)導(dǎo)致了全球變暖。As在此處引導(dǎo)非限制性定語從句，指代逗號(hào)后面主句的內(nèi)容，并在定語從句中充當(dāng)主語。故選B項(xiàng)。

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