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 |
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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 |
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