选择题：In case of accidents ______ the risk of sinking,all effective measures shall be taken to s

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题目内容：
In case of accidents ______ the risk of sinking，all effective measures shall be taken to steer clear of the fairway to avoid ______ the traffic．

A.involving／impeding

B.involved／to impede

C.involving／to impede

D.involved／impeding




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