People have proved _________ to be true that the heat we get from coal and oil comes from the sun.
People have proved _________ to be true that the heat we get from coal and oil comes from the sun.
A、that
B、it
C、this
D、/
【正确答案】：B
【题目解析】：prove it to be adj that 证明……是……的；it 为形式宾语，指代 that 从句
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