【題目】The reason ______ most Chinese have healthy white teeth is ______ they eat a healthy diet.

A. why; that B. why; because

C. which; that D. for; that

【答案】A

【解析】考查定語從句和表語從句。先行詞the reason后用why引導(dǎo)定語從句表示“……的原因”,系動(dòng)詞is后接表語,that用來引導(dǎo)表語從句。故選A。

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