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 这是一道语法题,考点是动词的时态。句子前半部分用的是过去时态,后半部分的动作发生在此之前,因此要用过去完成时。
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