----Sixteen-year-olds should not be allowed to drive a car. ----I agree. They are ____________A.too seriousB.not serious enoughC.too calmD.not enough serious
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B解析试题分析：句意：16岁不应该允许开车。我同意，他们还不够认真。Enough足够，在修饰形容词时放在形容词后面，修饰名词时放在名词前面。再结合题意选B。考点：考查形容词enough。