--- Sorry, I overslept. I forgot to set the alarm.

--- Your clock ____ . Perhaps you should buy a new one.

   A. never worked                                  B. never works

   C. had never worked                             D. is never working

—Sorry, I overslept .I forgot to set the alarm.

—Your clock         .Perhaps you should buy a new one.

A．never worked   B．never works     C．had never worked    D．is never working