______ was once regarded as impossible has now become a reality.A、WhatB、ThatC、

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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

解析此题考查连词的用法。因为本句为主语从句，what在从句中作主语，因此A是正确答案。本句的意思是：“曾经被认为是不可能的事情如今变成了现实。”

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