这是主语从句.is to leave here at once 是不定式做目的状语,其中is是谓语动词,缺少的是主语.
前面i have to do 中的do是个及物动词,所以要将它接的词语作为主语,用what.翻译成我必须要做的就是立刻离开这里
()i have to do is to leave here at once 选择
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