The city has improved a lot _________ I came here a few years ago.
A. for  B. since    C. before

B

解析試題分析：句意：自從我?guī)啄昵皝淼竭@里，城市已改善了很多。A. for因為，由于B. since 自從 C. before在……之前。由句意可看出選B。
考點: 考查連詞的用法。

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