He works as an engineer now, but he _____ on a farm for three years.
A．has workedB．workedC．was workingD．had worked
B

試題分析：句意，他現(xiàn)在是一名工程師，但是他在農場工作了三年。根據(jù)句意，我們知道他現(xiàn)在不在農場工作了。所以在農場工作的事是發(fā)生在過去的事了。所以應該用一般過去時態(tài)，選B。
點評：本題考查的是根據(jù)上下句的意思確定出正確的時態(tài)，難度不大。A選項和D選項有一定的迷惑性，但也很容易分辨：has worked表示從過去某一時間點一直持續(xù)到現(xiàn)在，但題干中已經說明“他”已經不在農場工作了，所以A項錯誤；had worked表示過去曾經，好像符合題意，但前半句用的
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