His father has worked in this factory _____ he came here in 1980.
A. since        B.  for        C.  when
A

試題分析：since由于，自從……以來；for為了，對(duì)于；when當(dāng)……時(shí)。句意：自從他1980年到這兒以來，他的父親就在這家工廠工作。故選A。
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