They eat less sugar and that is they have white teeth.

A.
because, healthy
B.
why, health
C.
because, health
D.
why, healthy

D
解析：
考查表語從句。此題考查了兩個知識點①that is why…意為“……的緣故”；
that is because…意為“那是因為……”②health是名詞healthy是形容詞。從題干所給的意義分析第一個空格只能用why，第二只能用作賓語的形容詞healthy。所以正確答案為D。

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They eat less sugar and that is ________ they have ________ white teeth.

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They eat less sugar and that is they have white teeth.