______ their service, the workers of the hotel are active in learning English. A．Improving B．To impr...
2022-12-18 03:54:42 96次 2014届福建省高二下学期第一次月考英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
______ their service, the workers of the hotel are
active in learning English.
A．Improving B．To improve C．Improve D．Having
improved
本题链接：
