Someone called me up in the middle of the night, but he Wap版

试题详情及答案解析

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

A．as

B．since

C．until

D．before

答案：D

试题分析：考查连词辨析。句意：有人在半夜给我打电话，但是在我接之前他就挂断了。as因为；since既然； until到……为止； before在……之前。根据句意故选D。
考点：连词辨析。