10．Life is a continual learning process for those who seek knowledge ______ they cross it over．（　�。�
A．asB．sinceC．ifD．till

分析 生活對于那些尋找知識之至將其轉(zhuǎn)變?yōu)樽约旱臇|西的人而言就是一個不斷學習的過程．

解答 答案；D 本題考查時間狀語從句．a(chǎn)s當．．時候，因為：since 自．．以來：if如果；  till直到．．結(jié)合上下文，知識是不斷追尋的，直到成為自己的東西．結(jié)合選項，故選D

點評 解答該類題時，首先要對選項用法有深刻的了解．確定它們各自不同于另外三項的用法，再結(jié)合選項，將其帶入句中，一般語意邏輯通順，即為正確答案．

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