【求助】明天考试了，问prep 2的一道题

RayeRach

Today's technology allows manufacturers to make small cars more fuel efficient now than at any time in their production history.
好心人帮忙分析下吧，都有哪些错
此题的正确答案是 Today't technology allows manufaturers to make small cars that are more fuel efficient than those at any other time in production history.
大谢啦！

饭饭609

Today's technology allows manufacturers to make small cars more fuel efficient now than at any time in their production history.
此处，their 指代不清楚，是代manufactures 还是small cars

lizhen5231747

1.楼上回答的
2.比较结构错误，原句是cars和time做比较了
3.比较范围错，原题错在今天和整个时间做比较，应该是和其他的每个时期做比较。

纹舞千瞳

偶觉得首先today和now是同样意思的单词重复，其次是平行结构。