selling和soldAspirin was first _____ in 1899 by the German company Bayer.为什么填selling 不填sold 有什么区别
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selling和soldAspirin was first _____ in 1899 by the German company Bayer.为什么填selling 不填sold 有什么区别
selling和sold
Aspirin was first _____ in 1899 by the German company Bayer.
为什么填selling 不填sold 有什么区别
selling和soldAspirin was first _____ in 1899 by the German company Bayer.为什么填selling 不填sold 有什么区别
selling是贩卖.出售的意思.是进行时.
sold是sell的过去式和过去分词.表示已经售完.
但是结合整个句子来看.
阿司匹林于1899年由德国贝尔公司首次出售.
在1899年开始出售.并不是说在1899年已经售完.
语法来讲.句子前面有was.就是is+doing的格式.
所以应该用selling.
不晓得这么解释你明白没.