I regret A having left the work B unfinished; I C should plan everything D ahead carefully.

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问题 I regret A having left the work B unfinished; I C should plan everything D ahead carefully.

选项 A、 
B、 
C、 
D、 

答案C

解析 应改为should have planned,表示“本来该做……而实际没有做”的虚拟意义。
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