问题补充:
单选题Theyhadgreatdifficulty____thepeople____inthefire.A.in rescue, trappingB.to rescue, trappedC.in rescuing, who trappingD.rescuing, trapped
答案:
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