Helen Thayer had fallen into a hole and was hanging on the ropes ________ to the sled?
A.tiedB.were tiedC.tyingD.being tied在线课程A
【巧解导析】结合题干与选项分析可知：B项前若有引导词which则为正确选项；C项与ropes搭配，逻辑关系不顺；D项being多余．
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