She was about halfway through her meal ___ a familiar voice came to her ears.A.while B.as C.where D.whenB错在哪里?

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She was about halfway through her meal ___ a familiar voice came to her ears.A.while B.as C.where D.whenB错在哪里?

She was about halfway through her meal ___ a familiar voice came to her ears.A.while B.as C.where D.whenB错在哪里?
She was about halfway through her meal ___ a familiar voice came to her ears.
A.while B.as C.where D.when
B错在哪里?

She was about halfway through her meal ___ a familiar voice came to her ears.A.while B.as C.where D.whenB错在哪里?
时间状语从句,此处用when .as 引导的时间状语从句有随着什么的变化而变化的意思或表示两个动作同时进行.

when当什么什么时候
be about表示要做还没有做,这里表示的是一个过去将来时
while和as均用在进行时态中

D be about ……when 是固定句型

这个句子表示 正要做某事时,发生了什么。用WHEN是固定用法