单项选择题
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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A.beaten
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If the sling bumps（）the beams，serious accidents may follow．
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I have（）damage below water line.
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