题文
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 |
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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 |
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