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

D

【解析】

試題分析：考查連詞辨析。句意：有人在半夜給我打電話(huà)，但是在我接之前他就掛斷了。as因?yàn)�；since既然； until到……為止； before在……之前。根據(jù)句意故選D。

考點(diǎn)：連詞辨析。

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