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    精英家教网 > 高中英语 > 题目详情
    They are putting too much carbon dioxide into the atmosphere, ______ prevents heat from escaping from the earth into space.              
    A．whatB．thatC．whichD．who
    C
    本题考查定语从句。Which引导非限制性定语从句，代指前面的一句话。句意：他们把太多的二氧化碳排到大气中，阻止了热从地球逃逸到太空中。
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