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When he was twelve, he had read ten story-books. (改成同义句)
________ ________ ________ he was twelve, he had read ten storybooks.
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解析：
解析：
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By, the, time |
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题目内容
句型转换
When he was twelve, he had read ten story-books. (改成同义句)
________ ________ ________ he was twelve, he had read ten storybooks.
|
By, the, time |