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

試題分析:句意：你必須戴上頭盔和救生衣用來保護自己，只是以防萬一你掉入水里。A萬一；B除非；C盡管；D因為，當(dāng)……時候。根據(jù)句意可知戴這些東西的目的只是起防備作用，故答案選A。
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