Since I broke my leg, my telephone hasn′t stopped ringing. My friends        to find out if the injury was serious.

A．were trying      B．had tried   C．have tried  D．are trying

Since I broke my leg, my telephone hasn't stopped ringing．My friends ________ to find out if the injury was serious．

1. A.
   were trying
2. B.
   had tried
3. C.
   have tried
4. D.
   are trying