He is very hard-working he never minds doing extra work.A. and B. but C. or D. so D [解析]句意: 他很勤奋.所以从不介意做额外的工作.A. and和,B. but但是,C. or或者, D. so因此.结合句意可知D正确. 题目和参考答案——青夏教育精英家教网—

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He is very hard-working _____he never minds doing extra work.

A. and B. but C. or D. so

D 【解析】句意: 他很勤奋，所以从不介意做额外的工作。A. and和；B. but但是；C. or或者； D. so因此。结合句意可知D正确。

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