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主动语态与被动语态互换.1、Students should obey the rules of

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主动语态与被动语态互换.1、Students should obey the rules of
主动语态与被动语态互换.
1、Students should obey the rules of the school.
2、We must take good care of our eyes.
3、Mary's room must be kept clean.
4、You can't see.the stars in the daytimes.
5、Must I do all the exercises?
/>Rules of the school should be obeyed. 

Our eyes should be taken good care of by us. 

Mary must keep her room clean. 

The stairs (原句拼错了) can't be seen in the daytimes. 

Must all the exercises be done by me?

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