When we returned from our holidays, we found everything _______. What _______ while we had been away?A.changed; had happenedB.changing; happenedC.had changed; has happenedD.was changing; happened
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A解析本题第一空前的everything与change之间有被动关系，即“一切都变了”，而不是“在变”，故应用过去分词表被动和完成，作宾语补足语。