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______was thought to be impossible in the past has now become a reality.A、WhatB
______was thought to be impossible in the past has now become a reality.A、WhatB
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2023-09-20
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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
本题考查主语从句的引导词。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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