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_____was once regarded as impossible has now become a realit

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_____was once regarded as impossible has now become a reality.A.what B.which c.that
which and why..
_____was once regarded as impossible has now become a realit
A 从横线到iimpossible 是主语,做了主语从句,has become是谓语, a reality是宾语 句意为 那些曾经被认为不可能的事情,现在已成真了
再问: 为什么不选C呢
再答: 当做主语从句时,只有从句在不缺少任何成分时才用that,在这里意为是什么东西或是事情,只能用what,有时表示什么地方时也要用what