_____was once regarded as impossible has now become a reality.A.That B.Which C.Who D.What

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_____was once regarded as impossible has now become a reality.A.That B.Which C.Who D.What
_____was once regarded as impossible has now become a reality.A.That B.Which C.Who D.What

_____was once regarded as impossible has now become a reality.A.That B.Which C.Who D.What
这个题的答案是D
主语从句的引导词在从句中充当主语,结合句意应该选D.
意思是
曾经被认为是不可能的事情成为了现实

D
what引导的主语从句