W: How long will it take you to fix my watchM: I’ll call you when it’s ready, but it shouldn’t take longer than a week. What is the probable relationship between the speakers() A: Operator and caller. B: Librarian and student. C: Customer and repairman.

[听力原文]W: How long will it take you to fix my watchM: It won’t be longer than a week and I’ll call you when it’s ready. What’s the probable relationship between the two speakers（） A: Boss and secretary. B: Librarian and student. C: Customer and repairman. D: Operator and caller.