The chief engineer stated______ he believed it was necessary to study the proposals for se

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The chief engineer stated______ he believed it was necessary to study the proposals for several more months before making a decision.

A.what

B.who

C.that

D.which

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_________。