题目内容

动词填空：

Mr Li was seen ______ (go) into the classroom five minutes ago.

答案：to go
提示：

 下列动词如用被动语态时“to”就不能省略：

下列动词如用被动语态时“to”就不能省略：

see、hear、feel、notice、behold、observe、watch、perceive


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