______was once regarded as impossible has now become a reality.

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问题 ______was once regarded as impossible has now become a reality.

选项 A、What
B、That
C、Which
D、As

答案A

解析 曾被认为不可能的事现在变成现实了。名词从句——名词从句的引导词是“what”,语序有变化,不同于正常语序。“what”代替了句中某个“事或物”,而这个“事或物”(名词)则被省略。(We once considered“something”as impossible)has now become a reality=(What we once considered as impossible)(从句作主语)has now become reality。
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