Today's technology allows manufacturers to make small cars more fuel-efficient now than at any time in their production history.
(A) small cars more fuel-efficient now than at any time in their
(B) small cars that are more fuel-efficient than they were at any time in their
(C) small cars that are more fuel-efficient than those at any other time in
(D) more fuel-efficient small cars than those at any other time in their
(E) more fuel-efficient small cars now than at any time in
Ans:想請問紅色字部份,were在此比較上為何可以省略
