_____ all the inventions have in common is _____ they have succeeded.
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。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
免费的网站请分享给朋友吧