问题
选择题
Not until I began to work ________ how much time I had wasted.
A．didn’t realize
B．did I realize
C．I didn’t realize
D．I realized
答案
答案：B
此题考查的是否定词放在句首，使用部分倒装，助动词往前提。not until放在句首从句不倒装，主句倒装，然后根据时态选B
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