what he emphasized over and over again was ___,no matter……what he emphasized over and over again was ___,no matter how diffcult it might be ,they should never retreat even for an inchA whether B what Cit D that为什么B不行呢

what he emphasized over and over again was ___,no matter……what he emphasized over and over again was ___,no matter how diffcult it might be ,they should never retreat even for an inchA whether B what Cit D that为什么B不行呢
what he emphasized over and over again was ___,no matter……
what he emphasized over and over again was ___,no matter how diffcult it might be ,they should never retreat even for an inch
A whether B what Cit D that
为什么B不行呢

what he emphasized over and over again was ___,no matter……what he emphasized over and over again was ___,no matter how diffcult it might be ,they should never retreat even for an inchA whether B what Cit D that为什么B不行呢
这是that 引导的表语从句,其间,插入了一个由 no matter 引导的让步状语从句
因为表语从句结构,句意完整,不可以选择what, 我们知道： that 无任何意义,只是个功能词汇

全句意为：
他所反复强调的就是不管有多大的困难他们都不应有丝毫退缩.

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Playing in my head over and over again 一直在我脑海里徘徊 Oh I think she's leaving, Oh man she's leaving, I don't know what else to do