[练习册] 比较结构

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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
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