万分纠结的一道GWD，求高手指点啊，万分感谢！！！

wjk

Q17:
Today’s technology allows manufacturers to make small cars more fuel-efficient now than at any time in their production history.

1. small cars more fuel-efficient now than at any time in their
   
2. small cars that are more fuel-efficient than they were at any time in their
   
3. small cars that are more fuel-efficient than those at any other time in
   
4. more fuel-efficient small cars than those at any other time in their
   
5. more fuel-efficient small cars now than at any time in
   

Answer: C
我一开始就把ABC给排除掉了，因为记得XDF老师说过n+that+be+adj是永远错的，因为可以直接用adj+n来表示。我选的是D，难道是因为那个their指代不明确吗？谢谢

Gail小M

这里是为了消除歧义，用了that从句.
more fuel-efficient small cars> more(adv) fuel-efficient or more(adj) small cars.
相比之下"small cars that are more fuel-efficient"  is clear...

wjk

想起来了，原来是这样。非常感谢！！！