Did you see Xiao Li at the party? No, ___ by the time I arrived.

1. A.
   she had left
2. B.
   she has left
3. C.
   she was left
4. D.
   she must left

Did you see Xiao Li at the party? No, ___ by the time I arrived.

A. she had left    B. she has left    C. she was left    D. she must left