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.

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问题 Not until I began to work______how much time I had wasted.
选项 A、didn’ t realize
B、did I realize
C、I didn’ t realize
答案B
解析 本题考查句子的部分倒装结构。当not…until置于句首时，句子要使用部分倒装，即将谓语的一部分如助动词或情态动词放在主语之前。如果句中的谓语没有助动词或情态动词，则需添加助动词do，does或did，并将其置于主语之前。本句正常语序为：I didn’t realize how much time I had wasted until I began towork．
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