She had golden hair when she was a child, but_________ she got older and older, her hair went darker and darker.   
A．whileB．whenC．a(chǎn)fterD．a(chǎn)s
D
本題是連詞的辨析使用。as表示“隨著”，通常表示前后動作發(fā)生的時間為一致的。when強調(diào)在一個動作發(fā)生過程中另一個事情突然發(fā)生。while表示兩個同時進行的持續(xù)性動作，且強調(diào)主句表示的動作延續(xù)到從句所指的整個時間。
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