--Has Peter handed in his paper yet?---I’m not sure. He on it last week.A. was workingB.

问题补充：

--Has Peter handed in his paper yet?

---I’m not sure. He on it last week.

A. was working

B. has worked

C. worked

D. had worked

答案：

(答案→)A. was working

B. has worked

C. worked

D. had worked

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