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 题目和参考答案——青夏教育精英家教网—

题目内容

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

【解析】

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。

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