Having been told that her son died in the accident, the old woman appeared very

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问题 Having been told that her son died in the accident, the old woman appeared very calm, as if nothing______.

选项 A、happened
B、were happened
C、was happened
D、had happened

答案 D

解析考察as if引导虚拟语气，主句时态是过去时，表示是与过去事实作比较，所以从句用过去完成时had happened，因为happen是不及物动词，所以没有被动语态，只能用主动形式表被动。

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