someone called me up in the middle of the night ,but they hung up ＿i could answer the phone A...

题目

someone called me up in the middle of the night ,but they hung up ＿i could answer the phone A...
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.

答案

D.before
有人在半夜给我打电话,但是还没等我接起电话前就挂掉了.