we were listening to the English broadcast_______they were watching English program

we were listening to the English broadcast_______they were watching English program

题目
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?
答案
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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