It's Saturday afternoon and Tom together with two of his classmates ________ new tricks on the skating ramp．

1. A.
   has tried
2. B.
   have tried
3. C.
   is trying
4. D.
   are trying

It’s Saturday afternoon and Tom together with two of his classmates         new tricks on the skating ramp.

A．has tried   B．have tried  C．is trying    D．are trying