________ was thought to be impossible in the past has now become a reality.A、Wha

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问题 ________ was thought to be impossible in the past has now become a reality.

选项 A、What
B、Which
C、That
D、As

答案 A

解析题干中有两个谓语动词was thought和has become，因此本句应为主从复合句，且空格所填词引导的从句作句子的主语，所以空格处应填一个主语从句的引导词且能在从句中作主语，故选A。

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