Someone called me up in the middle of the night,but they hang 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 hang up I could answer the phone.
A.as B.since C.until D.before
D
根据句中的转折连词but可知，“在我接电话之前，对方就把电话挂断了”，应选before连接主从句。