怎么学好英语 ... +③by the time引导的从句(注:从句谓语动词为过去式) +④before引导的从句(注:从句谓语动词为过去式)例如: 3. He had already built his own lab by the time he was ten.到十岁时,他已经建起了自己的实验室。 ...
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引导的从句例如
Introduce clauses such as
以上为机器翻译结果,长、整句建议使用 人工翻译 。
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