Question

Henry works as a teacher now, but he ______ on a farm for three years.

A．has worked

B．had worked

C．worked

D．had been working

Answer 1

C

考查时态的运用。句意：Henry现在是一位老师，但他曾在农场工作过三年。
点评：要善于确定句子时态，可以通过时间状语确定,还可以根据上下文来确定.但不能断章取义，要认真看清题意，像本题，单只从时间状语for three years 上看，这道题容易选A。