题目内容

They eat less sugar and that’s ______ they have ______ white teeth.
A．because, healthyB．why, health
C．because, healthD．why, healthy
D
考查连词及形容词。Why引导的从句内容表示的是结果，because引导的从句表示原因。healthy修饰名词teeth。句意：他们很少吃糖，那就是他们为什么有健康洁白的牙齿的原因。
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