标题: 【求助】关于过去时和现在时比较的一道题 [打印本页] 作者: achilles007 时间: 2012-11-12 20:42 标题: 【求助】关于过去时和现在时比较的一道题 wrong:In the Fischer-Tropsch process, which is developed in Germany by Franz Fischer and Hans Tropsch, coal is converted into a liquid fuel similar to petroleum.
right:In the Fischer-Tropsch process, which was developed in Germany by Franz Fischer and Hans Tropsch, coal is converted into a liquid fuel similar to petroleum.