People have proved______to be true that the heat we get from coal and oil comes from the s

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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./

请帮忙给出正确答案和分析,谢谢!

热搜:关于氨基酸代谢错误的论述是_________。