题目内容

It was on July 1, 2006 ___ Qinghai-Tibet railway began operation, ____ is a symbolic project in China’s West Development Strategy.
A.when; thatB.that; whenC.which; whenD.that; which
D
第一个空是强调句型,因此填that;第二个空是由which引导的非限制性定语从句。故选D。
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