Question

【题目】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

Answer 1

【答案】D

【解析】

试题分析：as因为，随着；since由于，自从……以来； until直到；before在……之前。句意：半夜有人给我打电话，但是在我回电话之前，他们就挂断了。结合语境可知选D。