答案：C
原因：
A.since与ago两介词重复
B.应是过去式,把come改成came
C.固定搭配
D.无此说法（现在完成时的时间状语只有1.since+过去式从句 2.时间段+ago）
the worker has liwed here for twenty years____ A.since twenty years agoB.since he come here
the worker has liwed here for twenty years____ A.since twenty years agoB.since he come here
C.twenty years ago D.twenty years before
原因啊 .
C.twenty years ago D.twenty years before
原因啊 .
英语人气：895 ℃时间：2019-11-05 02:43:49
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