◎ 题干
It was on July 1, 2006 ___ Qinghai-Tibet railway began operation, ____ is a symbolic project in
China's West Development Strategy.
[     ]
A. when; that      
B. that; when  
C. which; when  
D. that; which
◎ 答案
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◎ 解析
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◎ 知识点
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