2. 外语
  3. ______was thought to be impossible in the past has now become a reality.

______was thought to be impossible in the past has now become a reality.

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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，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，符合要求的只有A)。That可以引导主语从句，但仅起到连接作用，不在句中充当成分，可以排除；Which和As不能引导主语从句，也可以排除。所以确定答案为A)。
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