All your books must __________(放好) after a day's study.

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Allyourbooksmust__________(放好)afteraday''sstudy.Allyourbooksmust__________(放好)afteraday''sstudy.Allyou

All your books must __________(放好) after a day's study.
All your books must __________(放好) after a day's study.

All your books must __________(放好) after a day's study.
be put away

must be put away 书被放好是被动语态 must be done put away收好，放好 put过去分词还是put