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

試題分析：since自從……以來；for 為了，可以表示原因目的等；when當……時。句意：自從我?guī)啄昵皝淼竭@個城市以來，這個城市變得好多了。故選A.
點評：辨析題的基本原則就是了解各個選項的基本用法，然后結合語境具體分析，并注意每個詞的多種用法。
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