he ran back to my class room--------he had left his books --

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he ran back to my class room--------he had left his books -------
原句为 he ran back to my classroom.he left his book there合并为一句

额..我是不是可以这样理解,你的 ---- 是下划线的意思.
如果是这样,那就是 He ran back to my class room which he had left his books in.
这个是which作定语从句,因为left books和class room做连接,所以介词用in.
如果下划线不是限制只能填一个单词的,或者可以不填的情况：
也可是 He ran back to my class room in which he had left his books.
这里的in which是一个倒装的用法,一般是从句特别长的时候会用.
或者是 He ran back to my class room where he had left his books.
注意where作连接的话句子末尾就不要加介词了.
顺便说一句,是不是你的题目分类选错了...

he ran back to my class room--------he had left his books -- He ran back to my classroom.He left his books there 合并为一句 TESTTHREE 30.he ran back into the room to see if he had HE ran back into his room to see if he~anything behing. He left his book at home.He had to go back home ______ it. He ran back into the room to see if he _______anything behin He left his hometown sadly ,_____never to come back again He had to clean his room.He ___ ___ to clean his room.(同义句） :He ran to the station only to find the train had left 这句话是不 He quickly ran back to his flat and poured water over his ja he left his homeland_____never___come back again. Only when class began_____that he had left his book at home.