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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           C. unless          
C. though             D. as
A

试题分析:句意:你必须戴上头盔和救生衣用来保护自己,只是以防万一你掉入水里。A万一;B除非;C尽管;D因为,当……时候。根据句意可知戴这些东西的目的只是起防备作用,故答案选A。
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