他在做作业时,我在看电视.While he --- doing his homework,I --- watching

问题描述：

他在做作业时,我在看电视.While he ___ doing his homework,I ___ watching TV.
他在做作业时,我在看电视.
While he ___ doing his homework,I ___ watching TV.
请问这里用现在进行时还是过去进行时?
为什么?

1个回答分类：英语 2014-10-20