Jim: I’ve had a lot of trouble getting through to you. Your call centre wouldn’t put me

Jim: I’ve had a lot of trouble getting through to you. Your call centre wouldn’t put me through. Clerk: I’m sorry. We’ve been very busy this morning. Please explain the problem, and I’ll see what I can do. 20. From the conversation above, we know Jim has the problem about________.A．thephoneB．callingC．center