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I ________ at the station half an hour ago,but the train ___

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I ________ at the station half an hour ago,but the train ________ yet.
A.arrive;didn’t come
B.was arriving;hadn’t come
C.arrived;hasn’t come
D.had arrived;didn’t come
I ________ at the station half an hour ago,but the train ___
答案C
半小时以前表明是发生在过去的动作,第一空要用一般过去时;但是到现在火车还没来,故第二空用现在完成时.