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

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

admin2009-02-15  33
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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