At the time of the earthquake Jeff was still in his office. He to finish a project before he left for the day.A. has tried B. had triedC. has been trying D. had been trying 题目和参考答案——青夏教育精英家教网—

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At the time of the earthquake Jeff was still in his office. He to finish a project before he left for the day.

A. has tried B. had tried

C. has been trying D. had been trying

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