______was one regarded as impossible has now become a reality.A、WhatB、ThatC、Wh

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

选项 A、What
B、That
C、Which
D、As

答案 A

解析本题考查连词的用法。因为本句为主语从句，what在从句中做主语，因此A为正确答案。

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