2. 专升本
  3. Not until I began to work did I realize how much time I______.

Not until I began to work did I realize how much time I______.

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问题 Not until I began to work did I realize how much time I______.
选项 A、wasted
B、have wasted
C、was wasted
D、had wasted
答案D
解析 本句中waste这一动作发生在realize之前，所以应用过去完成时。故选D。
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