—You______him of the great risks involved. — I did. But he didnt take it seriously.A.must

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—You______him of the great risks involved. — I did. But he didnt take it seriously.

A.must warn

B.might warn

C.could have warned

D.ought to have warned

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_________。