用by the time和before造两个完成时的句子

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用bythetime和before造两个完成时的句子用bythetime和before造两个完成时的句子用bythetime和before造两个完成时的句子HehadleftChinebythetim

用by the time和before造两个完成时的句子
用by the time和before造两个完成时的句子

用by the time和before造两个完成时的句子
He had left Chine by the time when he was 40 years old.
He had left Chine before he was 40 years old

By the time I got outside, the bus had already left
i've never met you before