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 |
相关试题
After he left college , he was employed in an international company and __
___there ever since .
| A．worked | B．has worked | C．had worked | D．was working |
Unsatisfied ______with the payment ,he took the job just to get some work experience.
| A．though was he | B．though he was | C．he was though | D．was he though |
Bob would have helped us yesterday, but he_______
| A．was busy | B．is busy | C．had been busy. | D．will be busy |
Green products are becoming more and more popular because they are environmentally_______.
| A．friendly | B．various | C．common | D．changeable |
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