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

考查時態(tài)的運用。句意：Henry現(xiàn)在是一位老師，但他曾在農(nóng)場工作過三年。
點評：要善于確定句子時態(tài)，可以通過時間狀語確定,還可以根據(jù)上下文來確定.但不能斷章取義，要認真看清題意，像本題，單只從時間狀語for three years 上看，這道題容易選A。