单选题
______ all the inventions have in common is ______ they have succeeded.
A. That...what B.What...that C. That...that D. What...what
【正确答案】
B
【答案解析】本题考查的是what与that，的区别。what在其引导的名词性从句中担任句子成分，多为主语、宾语或表语，表示……的东西；而that，引导表语从句等时，在从句中不担任实际成分，本身没有意义，所以选B。