It is earths heat______ scientists have developed a sensitive instrument to measure.A.whoB

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It is earths heat______ scientists have developed a sensitive instrument to measure.

A.who

B.whom

C.that

D.what

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_________。