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You have to wear a helmet and a life jacket for protection, just ___ you fall into the water.

A. in case B. unless

C. though D. as

A

【解析】

试题分析:句意是:你不得不戴头盔穿安全服,以防万一你落在水里面。in case 以防万一; unless 除非; though 尽管;as由于,故选A

考点:考查状语从句。

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