问题
选择题
____ their service, the workers of the hotel are active in learning English. [ ]
A. Improving
B. To improve
C. Improve
D. Having improved
答案
答案：B
搜题请搜索小程序“爱下问搜题”
____ their service, the workers of the hotel are active in learning English. [ ]
A. Improving
B. To improve
C. Improve
D. Having improved
答案：B