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A cough is usually nothing to worry about unless it lasts for ten days ___.

A. or more       B. instead          C. at most         D. only

A


解析:

题意是“咳嗽通常情况下没什么担心的,除非它要持续1天或者更长时间”。or more中的or表示选择关系,不是构成固定结构,其后省略了days。at most最多;instead代替;only仅仅,只有。

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