I first met Lisa three years ago. She ________ at a radio factory at the time.
A.hasworkedB.wasworkingC.hadbeenworkingD.hadworked...
A. has worked B. was working C. had been working D. had worked
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答案B 根据上下文我们可推测为这里指的是“三年前的”情况，表示“当时他正在一家无线电厂工作”。 查看原帖>>
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