问题补充：
The city has improved a lot I came here a few years ago.
A. for B. since C. before
答案：
解析：句意：自从我几年前来到这里，城市已改善了很多。A. for因为，由于B. since 自从 C. before在……之前。由句意可看出选B。
考点: 考查连词的用法。
如果觉得《The city has improved a lot I came here a few years ago.A. for B. since C. before》对你有帮助，请点赞、收藏，并留下你的观点哦！
