______the damage is done, not even modern surgery can undo it entirely.A、Though

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问题 ______the damage is done, not even modern surgery can undo it entirely.

选项 A、Though
B、For
C、Once
D、Unless

答案 C

解析本题考查状语从句。句意：一旦造成破坏，即使是现代手术也无法完全治愈。though“尽管”，引导让步状语从句；for“因为”，引导原因状语从句；once“一旦”，引导条件状语从句；unless“除非”，引导条件状语从句。根据句意，本题选C。

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