英语什么情况下只能使用AS引导的从句.比如这道题：（ ）is mentioned above,the

英语什么情况下只能使用AS引导的从句.比如这道题：（ ）is mentioned above,the

which不能做主语?这类题常考的.首先你要明了这是个定语从句.其次,这是从句在前,主句在后.定语从句的先行词是主句一整个句子.当先行词是主句一整个句子的时候,这个定语从句只能用Which或As来引导,但是,Which引导的从句只能放在主句的后面.排除了A.D是个代词不是连词,排除.你再领会下这几个句子,全是对的：As is mentioned above,the number of the students in senior school is increasing.The number of the students in senior school is increasing, which/ as is mentioned above.这两个是定语从句It is mentioned above that the number of the students in senior school is increasing这是IT作形式主语,THAT引导的主语从句放在了后面.What is mentioned above is that the number of the students in senior school is increasing这是主语从句+IS系动词+表语从句考试时,这几个句型常拿来考查.

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