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
考查倍數(shù)問題。倍數(shù) + as + 形容詞，句意：這輛汽車調(diào)了發(fā)動機(jī)和換了輪胎以后性能好了一倍。選C。
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