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  3. ______ was once regarded as impossible has now become a reality.

______ was once regarded as impossible has now become a reality.

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问题  ______ was once regarded as impossible has now become a reality.
选项 A、That
B、Which
C、Who
D、What
答案D
解析 此题考查句意理解、代词。首先应读懂全句，判断出全句的大意为“一度曾被视为不可能的事如今已成为现实。”明确填充处缺少一个关系代词，表示“物”，在从句中作宾语，引导该句作全句的主语成分。后审读四个选项，并判定，What可用于代表“物/事情”，符合句意，选D为答案。
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