50.When Mark opened the door, he saw a woman standing there. Heher before.

A. never saw

B.had never seen

C. never sees

D.has neverseen

正确答案：B

解析：

50.【翻译】当马克打开门时，他看到一个女人站在那里：他以前从来没有见过她【精析】B根据第一句中的saw和第二句中的时间状语before可知，此处表达的是“在打开门看到她之前从没有见过她”，所以第二句应用过去完成时，表示动作发生在“过去的过去”。故选B。

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