Someone called me up in the middle of the night,but they hung 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 hung 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 hung 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 hung up ____I could answer the phone.

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

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

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

Someone called me up in the middle of the night,but they hung up ________I could answer the phone.

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

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

A. as       B. since

C. until   D. before

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

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