all the inventions have in mon is they have succeeded.
A. What; what
B. That; what
C. What; that
D. That; that
网友回答
A. What; what
B. That; what
(答案→)C. What; that
D. That; that
解析：考查名词性从句的连接词。What在名词性从句中做主语，宾语，宾语；that在名词性从句中只起连接作用，不充当任何成分，没有任何意思。第一空的what引导主语从句，并在句中做have的宾语。第二空That引导表语从句，在句中不充当任何成分。句意：所有的发明的共同之处是甜蜜都很成功。故C正确。