They had great difficulty ____ the people ____ in the fire.A.in rescue, trappingB.to rescue, trappedC.in rescuing, who trappingD.rescuing, trapped
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D解析考查difficulty和过去分词做后置定语，固定短语have great ditticulty( in )doing sth意思“做某事有很大困难”，后面的trapped修饰前面的people意思“被困在火里的人”，根据意思，可知选D