题目内容：

23.Medicalaccidents _____ by drugs have attracted much attention in that country.
A.causing B.to be caused C.be caused D.caused

优质解答

caused 在这里是过去分词,充当定语,相当于 which / that was caused；
be caused 是动词原形,动词原形通常不做定语；
句子意思：由药物引起的医疗事故在那个国家已经引起了极大的关注.