You will have to wait for one more week, the manager will be back from his trip.
A. after
B. while
C. when
D. since
网友回答
A. after
B. while
(答案→)C. when
D. since
解析：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。