— why didn't you try your best to get on the bus?

— I tried to,but ________ I could,it started moving．

1. A.
   until
2. B.
   when
3. C.
   before
4. D.
   after

—Why didn’t you try your best to get on the bus?

—I tried to , but _______ I could, it started moving.

A．before             B．when               C．until                D．after

---Why didn’t you try your best to get on the bus?

  ---I tried to, but _____ I could, it started moving．

      A．until                B．when      C．before              D．after

― Why didn’t you try your best to get on the bus?

 ― I tried to, but ______ I could, it started moving.

A. until                  B. when                C. before                      D. after

—Why didn’t you try your best to get on the bus?

—I tried to , but _______ I could, it started moving．

A．until　　　　 B．when　　　　　 C．before　　 D．after

一Why didn’t you try your best to get on the bus?

一I tried to，but   I could，it started moving．

一Why didn’t you try your best to get on the bus?

一I tried to，but ______ I could，it started moving．

A．until        B．when        C．before          D．after

一Why didn’t you try your best to get on the bus?
一I tried to，but ______ I could，it started moving．

一Why didn’t you try your best to get on the bus?
一I tried to，but   I could，it started moving．