问题描述：
改为被动1I saw him go into the classrom.2did he buy you the book you wanted?第一句,
He was seen to go into the classsrom.he was seen go into the classroom.he was seen going into the classro0m.哪个对
He was seen to go into the classsrom.he was seen go into the classroom.he was seen going into the classro0m.哪个对
问题解答：
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