"Today has been so busy! There has been back-to-..... calls since the phones turned on," the customer service representative told her friend who had stayed home sick.

"Today has been so busy! There has been back-to-..... calls since the phones turned on," the customer service representative told her friend who had stayed home sick. (*) front (*) beginning (*) start (*) back


This is a companion discussion topic for the original entry at https://english.best/questions/13255,today-has-been-so-busy-there-has-been-back-to-___-calls-since-the-phones-turned-on-the-customer-service-representative-told-her-friend-who-had-stayed-home-sick/