你必须先唱一首英文歌.
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你必须先唱一首英文歌.
你必须先唱一首英文歌.
你必须先唱一首英文歌.
You must sing a song first
You must/ have to sing an English song first.
You have to start with an English song.
You must sing an English song first.
You must / have to / are supposed to/ are required to /are asked to sing an English song first.