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问题: 将句子改为被动语态……………………急急急急急急急急急急急急急急

He doesn't operate this machine. This machine_____ ______

Students must obey the school rules . The school rules_____ ______ _______ by students

I will study French later on. French _____ _____ _____ later on.

解答:

This machine is not operated by him
The school rules must be obeyed by students
Frebch will be studyed by me later on