It is true that he has made a very important discovery in ch

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It is true that he has made a very important discovery in chemistry.为啥是主语从句?
对于”It's +形容词+其他“ 这类的一般都为主语从句吗？有没特例？

因为it是形式主语.
that he has made a very important discovery in chemistry.这是that引导的主语从句.是真正的主语.
不是同位语从句,同位语必须有先行词,比如：
The news that we won the game is exciting.
that从句是同位语从句,他是news的同位语,说明的是news的内容,
你给的句子根本没有像news一样的先行词!
不是说一定是主语从句,只是说it是形式主语,比如：
It is fun to play computer games.
这里就不是主语从句,而是不定式做主语.

英语代词题It is true that __ of English vocabulary has made it in -- that they had made an important discovery in science. How is it （）he has made such rapid progress?A that Bwhy Cwh It is very important for us parents to be ( )in educating ch （）that they had made an important discovery in science Litt 15._____ that they had made an important discovery in scienc He made another wonderful discovery( ) of great important to 英语翻译One discovery I made about giving away is that it is alm it is years of hard work that has made him what he is today. he has made a discovery,_______ of great importance to the p He has made another wonderful discovery,____of great importa It is the discovery of Cao Cao's tomb,____was made in Anyang