Question

Joy _______ as a language teacher in China for two years before she went back to London.

1. A.
   had worked
2. B.
   was working
3. C.
   worked
4. D.
   has worked

Answer 1

A
试题分析：句意：乔伊去伦敦之前，已经在中国做了两年的语言老师了。作为语言老师这个动作发生在went back回去之前，所以用过去完成时，故选A
考点：时态
点评：动词的时态是学习英语过程中非常重要的知识。而很多的题目，句中并没有像本题一样有明确的时间，很多要通过上下文的判断得知。过去完成时表示动作发生在过去的过去，本题不难，平时加强记忆，理解即可。