_____ is well known to the world is that China has very top technology in space industry．
A．ItB．AsC．WhatD．Which
C

試題分析：句意：眾所周知的事情是中國有太空行業(yè)非常高端的技術(shù)。第二個is是謂語，前面是主語從句，主語從句缺少主語，用what連接，It可以做形式主語，但是后面第二個is是多余的，As可以引導非限制性定語從句，第二個is應該改成逗號，that可以引導主語從句，但是不能在從句中做成分，所以選C。
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