12．Not until I began to work ____ how much time I had wasted．（　�。�
A．didn't I realizeB．did I realize
C．I didn't realizeD．I realized

分析 直到我開始工作，我才意識到我浪費了多少時間．

解答 答案：B 
not until 位于句首，主句部分倒裝，A項多了not，not 已經(jīng)在句首；CD兩項沒有倒裝，所以選擇B．

點評 英語部分倒裝用法歸納    1．否定副詞位于句首時的倒裝     2．"only+狀語"位于句首時的倒裝    3．"so+adj．/adv．"位于句首時的倒裝
4．"so+助動詞+主語"倒裝    5．由not only…but also引出的倒裝

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