Not until I dropped off from school ____ how much time I had wasted.
A．didn't I realizeB．did I realize
C．I didn't realizeD．I realized
B

試題分析:考查倒裝句。Not until結構放在句首時，主句要用部分倒裝語序，故排除C、D選項，因為not已經(jīng)提至until從句前，后面不能再用否定詞，所以B選項正確。句意：直到我輟學后，我才意識到我浪費了多少時間。
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