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问题: 英语英语~~~~

_____she couldn't understand was ____,after having been short of supplies for so many days ,the climber could survive.
A What ...that B What ...how C Which ... why D That ...that 帮忙分析一下句子结构 谢谢 

解答:

我认为答案 为A ,首先after having been short of supplies for so many days,为插入语,作状语,可以先不看!!然后看其他的分句,这里是有WHAT引导的主语从句!!!!!!!!