He works very hard.He doesn't go to bed ( )eleveHe works very hard.He doesn't go to bed ( )eleven o'clock every night.

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He works very hard.He doesn't go to bed ( )eleve
He works very hard.He doesn't go to bed ( )eleven o'clock every night.

根据句子的意思,填until是最合适的,这题考察的是对句意的理解