Not until I began to work did I realize how much time I______.A、wastedB、have wa

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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、had wasted
D、was wasted

答案 C

解析本题考查时态。句意：直到我开始工作，我才意识到我以前浪费了多少时间。根据句意可知，waste time发生在began to work之前，应该用过去完成时。故本题选C。

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