题目内容
It is surprising that Jack, who is only 39 years old, _______ in the field of engineering for 20 years when he entered the company last month.
A. worked B. had worked C. has worked D. working
B
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题目内容
It is surprising that Jack, who is only 39 years old, _______ in the field of engineering for 20 years when he entered the company last month.
A. worked B. had worked C. has worked D. working
B