________theirservice,theworkersoft

发布时间：2020-07-11 07:41:14

________ their service, the workers of the hotel are active in learning English.













A.Improving












B.To improve











C.Having improved











D.Improved

网友回答

B解析导解：用不定式作目的状语，学外语是为了改进服务．
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