The children must( ) (stay) away from the building同上

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The children must( ) (stay) away from the building同上
The children must( ) (stay) away from the building
同上

The children must( ) (stay) away from the building同上
The children must(stay)away from the building
must后面跟动词原形

The children must(stay ) away from the building
情态动词之后,接动词原形。