_____ all the inventions have in common is ______ they have succeeded.
A．What; what 　B．That; whatC．What; that 　 D．That; that
C

試題分析：考查名詞性從句的連接詞。What在名詞性從句中做主語，賓語，賓語；that在名詞性從句中只起連接作用，不充當任何成分，沒有任何意思。第一空的what引導主語從句，并在句中做have的賓語。第二空That引導表語從句，在句中不充當任何成分。句意：所有的發(fā)明的共同之處是甜蜜都很成功。故C正確。
點評：What在名詞性從句中做主語，賓語，賓語；that在名詞性從句中只起連接作用，不充當任何成分，沒有任何意思。
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