I regret______ the work unfinished; I should have planned everything ahead carefully.A.hav

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I regret______ the work unfinished; I should have planned everything ahead carefully.

A.having been left

B.having left

C.to leave

D.to have left

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_________。