的划A 的意思变成了这个工厂可以更有效的制造这个车,而且少了they did,所以这里的that一定不能省略, Today’s technology allows manufacturers to make small cars more fuel-efficient than they did at any time in their production history。
请问大牛。
C选项 small cars that are more fuel-efficient than those at any other time in
中those at any other time 的时态应该是过去式吧,不同于that are more fuel-efficient的现在时,按道理those后面应该加一个were,为什么没有加呢?