They eat less sugar and that’s ______ they have ______ white teeth.
A．because, healthyB．why, health
C．because, healthD．why, healthy
D
考查連詞及形容詞。Why引導(dǎo)的從句內(nèi)容表示的是結(jié)果，because引導(dǎo)的從句表示原因。healthy修飾名詞teeth。句意：他們很少吃糖，那就是他們?yōu)槭裁从薪】禎嵃椎难例X的原因。
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