One year has passed ____the earthquake happened.A.since B.when C.before D.that

问题描述:

One year has passed ____the earthquake happened.A.since B.when C.before D.that
为什么

答案选A,one year has passed是现在完成时,而现在完成时可以用来表示发生在过去某一时刻的,持续到现在的动作(用行为动词表示)或状态(be动词表示)常与for(+时间段),since(+时间点或过去时的句子)连用.