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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.
这是曼哈顿语法里的一道时态题,不明白这个地方为什么要用过去式,而不可以用现在时,难道被发明不是描述的一个一般规律吗?求大牛帮助! |
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