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The reason ______ most Chinese have healthy white teeth is ______ they eat a healthy diet.
A.why; thatB.why; becauseC.that; thatD.for; that
A
考查定语从句及名词性从句。句中why引导定语从句,先行词the reason在从句中作原因状语;that引导表语从句,故选A。
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