Today's technology allows manufacturers to make small cars more fuel-efficient now than at any time in their production history.
small cars more fuel-efficient now than at any time in their
small cars that are more fuel-efficient than they were at any time in their
small cars that are more fuel-efficient than those at any other time in
more fuel-efficient small cars than those at any other time in their
more fuel-efficient small cars now than at any time in
A的意思是使小汽车更节能
BC的意思是制造出更节能的小汽车
DE的意思是制造更多的节能车
BC的意思更合逻辑,而B里面用代词they表示同一批汽车,不对,应该用those,选C
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