题目
We must clean the classroom every day.
He swept the floor yesterday.
Jim bought a new bike last week.
Adison invented the light bulb.改为被动语态
He swept the floor yesterday.
Jim bought a new bike last week.
Adison invented the light bulb.改为被动语态
提问时间：2020-06-17
答案
The classroom must be cleaned every day
The floor was swept yesterday
A new bike was bought (by Jim) last week
The light bulb was invented by Adison
The floor was swept yesterday
A new bike was bought (by Jim) last week
The light bulb was invented by Adison
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