He is so determined!He on the problem for two hours, and he will go on with it until he works it out． [ ] A．works B．worked C．is working D．has been working 题目和参考答案——青夏教育精英家教网—

题目内容

He is so determined!He ________ on the problem for two hours, and he will go on with it until he works it out．

[　　]

A．works

B．worked

C．is working

D．has been working

答案：D

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