Better wear special clothing, a helmet and a life jacket, just your raft gets upside down or even sinks.
A. in case
B. so that
C. as though
D. in order that
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(答案→)A. in case
B. so that
C. as though
D. in order that
解析：连词辨析。A以防；B以至于；C似乎，好像；D为了；句意：最好穿上特殊的衣服，戴好头盔和救生衣，以防你的木筏翻掉了。根据句意说明A正确。