Not until the next morning how serious the situation wasA. did she realiseB. had she rea

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(答案→)A. did she realise
B. had she realised
C. she realised
D. she had realized
解析：考查时态，及倒装。句意：直到第二天早晨，她才意识到情况是多么的严重。结合语境可知主句描述的是过去发生的动作，故用过去时态。当not until位于句首时，主句采用部分倒装，故选A。