My car’s performance is ___ since the engine’s been tuned and the tires have bee

题型：不详难度：来源：

My car’s performance is ___ since the engine’s been tuned and the tires have been changed．

A．better as twice	B．twice as the condition
C．twice as good	D．twice as better

答案

C

解析

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。