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题目
before until的转换
他是对抗菌物质进行了长达九年的实验才有所发现的.两种翻法:1,He experimented with antibacterial substances as long as nine years before he made his discovery.2,He didn't make his discovery until he experied with untibacterial substances as long as nine years.这两个句子都对吗个?第2个句子主句主语和从句主语相同是否可以写得更简略点,

提问时间:2020-07-27

答案
都可以.第二个句子可改写成:He didn't make his discovery until having experied with untibacterial substances for nine years.
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