Someone called me up in the middle of the night, but they hang up ____ I could answer the phone.

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

Someone called me up in the middle of the night, but they hang up ________ I could answer the phone.

    A. as　 B. since　  C. before   D. until　 

Someone called me up in the middle of the night, but they hang up ____ I could answer the phone

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

Someone called me up in the middle of the night, but they hang up ________ I could answer the phone.