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

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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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