Since I broke my leg, my telephone hasn't stopped ringing．My friends ________ to find out if the injury was serious．A.were tryingB.had triedC.have triedD.are trying
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A解析考查时态。根据句末的was serious可知是对过去情况的叙述，再结合句中的my telephone hasn't stopped ringing可知是过去一段时间内一直持续的动作，所以用过去进行时。