From his expression, I don’t think he could have finished his homework last night, ?A. couldn’t he B. do IC. did he D. hasn’t he 题目和参考答案——青夏教育精英家教网—

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From his expression, I don’t think he could have finished his homework last night, _______?

A. couldn’t he B. do I

C. did he D. hasn’t he

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