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

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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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