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问题: 高中语法从句部分

_ all the inventions have in comman is _ they have succeed
------
_ all the inventions have in comman 做主语,不缺成分应该用that吧?不用that是为什么?
_ they have succeed 做表语,缺少成分,应该是填what,否则是为什么?

解答:

_ all the inventions have in comman is _ they have succeed
------
_ all the inventions have in comman 做主语,不缺成分应该用that吧?不用that是为什么?
_ they have succeed 做表语,缺少成分,应该是填what,否则是为什么?

1。这里是主语从句,缺宾语,应该是what作have的宾语
2。they have succeed 作表语。但不缺任何成分,因为succeed是不及物动词,表语从句不缺任何成分是要用that