Question

【题目】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

Answer 1

【答案】A

【解析】考查定语从句和表语从句。先行词the reason后用why引导定语从句表示“……的原因”，系动词is后接表语，that用来引导表语从句。故选A。