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My car’s performance is ___ since the engine’s been tuned and the tires have been changed.
A.better as twiceB.twice as the condition
C.twice as goodD.twice as better
C
考查倍数问题。倍数 + as + 形容词,句意:这辆汽车调了发动机和换了轮胎以后性能好了一倍。选C。
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