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

A.insteadB.or moreC.at mostD.Only

B

解析试题分析:句意:咳嗽通常没什么可担心的除非一直持续十天左右。instead 代替;or more 大约,左右,放在数字之后相当于about,但是about常位于数字之前。at most至多;only仅仅。将四个选项带入分析语境,B 最佳。
考点: 考查副词的用法。

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