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-You look tired. -Yes. I without rest until twelve o'clock. [ ] A.am workingB.wa

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-You look tired. -Yes. I without rest until twelve o'clock. [ ] A.am workingB.wa

—You look tired.

—Yes. I ________ without rest until twelve o'clock.

[]

A.am workingB.was workingC.has workedD.had worked

试题答案

答案: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。