provided在本句为conj,[常 that; 表条件] 在…条件下; “若是,假如“倘若,假若,只要 (only if)
；而unless是“除非,除非,如果不 (= if…not)”
因此选provided.
英语中条件状语从句的问题.You can arrive in Beijing earlier for the meeti
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