---Youlooktired.---Yes.I________withoutrestuntiltwelveo'clock.A.amwor

发布时间:2020-08-06 19:42:24

---You look tired.---Yes. I ________ without rest until twelve o'clock.A.am workingB.was workingC.has workedD.had worked

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B解析本题考查时态。由句中“直到十二点为止”可以判断,这是描述与现在时间无关的过去动作,用过去进行时。
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