Youwillhavetowaitforonemoreweek,_____themanagerwillbebackfromhistrip.
A.afterB.whileC.whenD.since在线课程C
when引导的非限定性定语从句，本句中的when =" by" which time，“到那时候”。after和since都错在时间的先后顺序，而while引导时间状语从句不用将来时。
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