我晚上10:00前必须上床睡觉.I have to﹙﹚ in bed﹙﹚o'clock in the evening.

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我晚上10:00前必须上床睡觉.I have to﹙﹚ in bed﹙﹚o'clock in the evening.

be before (你可能少打了个数字10)
I have to﹙be﹚ in bed﹙before﹚10 o'clock in the evening.

be by ten
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