Someone called me up in the middle of the night, but they hung up I could answer
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Someonecalled me up in the middle of the night, but they hung up __________ I couldanswer the phone.
A. as B.since
C.until D.before
试题答案
答案：D
提示：before常与can, could连用，表示“还没来得及……就……”。
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