Not until I began to work ______ how much time I had wasted.

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问题 Not until I began to work ______ how much time I had wasted.

选项 A、didn’t I realize
B、did I realize
C、I didn’t realize
D、I realize

答案B

解析 Not until导的时间状语从句,后面的主句要用倒装结构,故选B。
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