The reason ______ most Chinese have healthy white teeth is ______ they eat a healthy diet.
A．why; thatB．why; becauseC．that; thatD．for; that
A
考查定語(yǔ)從句及名詞性從句。句中why引導(dǎo)定語(yǔ)從句，先行詞the reason在從句中作原因狀語(yǔ)；that引導(dǎo)表語(yǔ)從句，故選A。
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