This book must______(not take) out of the library.

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This book must______(not take) out of the library.
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This book must______(not take) out of the library.
This book must______(not take) out of the library.

This book must______(not take) out of the library.
not been taken
书禁止被带到图书馆外

must not be taken out....
情态动词的must后跟动词原形的be这个助动词,再加上taken这个过去分词,就构成了被动语态。

This book must___not be taken___(not take) out of the library.
这里是情态动词的被动语态,且是否定,根据must,用mustn't be taken
望采纳~

must not be taken