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问题: 求助一道英语题C

Henry works as a teacher now,but he____on a farm for three years.



A. worked



B. has worked



C. had worked



D. had been working
请对各选项加以分析。谢谢!!

解答:

这道题讲过,应该选A。
题中说:Henry works as a teacher now,意思是他现在是一个老师,说明在农场工作三年时已经结束的事,只需用过去时。
B.体重并没有强调对现在的影响。
C.一般情况下,如果想用过去完成事态,必须还应在有一个相应的过去时和他比较,题中并没有。
D.现在完成进行时,表示动作还将延续,不符合题意。
这道题只要把握住now的表达意思,就可以明确是A。