we were listening to the English broadcast_______they were watching English programA while B as C then D when 是选while还是选when 为什么?

分类: 作业答案 • 2022-07-21 22:29:37

问题描述：

we were listening to the English broadcast_______they were watching English program
A while B as C then D when
是选while还是选when 为什么?

答

选While 表示前后对比而且一般而言,表示“当----的时候”时,while后面都跟进行时