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题库 / Prep2007E2-SC-131
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
请看讲解视频
首先排除 than at any time 因为这样就暗示比较了时间，但是now 和 at any time不平行；其次看句意是车的节能属性比较，而非车的数量的比较；they和those选those 指示代词，不是自己和自己比；
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