we were listening to the English broadcast-------they were w

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?
1个回答 分类：英语 2014-10-28

问题解答：

我来补答
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
 
 
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