---Tom,youlooktiredthismorning．What'swrong?---IwassobusythatIdidn&#

发布时间：2020-08-06 20:15:08

---Tom, you look tired this morning．What's wrong?---I was so busy that I didn't go to bed ________ 12 o'clock last night．A.untilB.whenC.thoughD.unless

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A解析考查点：连词辨析。解题思路：根据句意：汤姆，今天上午你看起来很累。怎么了？我非常忙以至于昨天晚上12点才上床睡觉。not…until…表示“直到……时候才……”。故选A。
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