A thief who broke into a church was caught because traces of wax, found on his clothes, ______ from the sort of candles used only in churches.
 
【正确答案】 A
【答案解析】 考查时态。句意为“一个闯入教堂的小偷被抓了,因为在他衣服上发现的蜡迹来自只有教堂使用的一种蜡烛”。该句是由because引导的原因状语从句。主语中包含定语从句“who broke into a church”,从句中的“found on his clothes”为插入语,只起到修饰traces of wax的作用。为了使because所引导的句子成分完整,要选择谓语动词。主句为一般过去时,从句动作发生在主句之前,用过去完成时。故本题选A。