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问题: 英语单选

_ all the inventions have in comman is _ they have succeed 是不是第一个填that第二个填what.?是不是all.....作they have succeed的宾语

解答:

第一个填what,第二个填that。
主语:what all the inventions have in common
谓语:系动词 is
宾语:that引导的宾语从句,即 that they have succeed.