We have not been to the Great Wall for ages.No ,I don not remember how many years ago____I last

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• We have not been to the Great Wall for ages.No ,I don not remember how many years ago____I lastvisited it.A it was that B was it thatC It was whenD was it when 答案选C　,为什么,但是我觉得应该用when啊?
• We have not been to the Great Wall for ages.No ,I don not remember how many years ago____I last
• Have you ever been to the Great Wall in China? It is 46of the wonders of the world and is 47to people all over the world. The Great Wall 48long ago. Everybody in China will tell you that it was built in the Qin Dynasty (秦朝). In Fact it 49a long period of time in China’s 50. We can 51tell how many years it took. We don’t know how many stones 52build the wall. We don’t know how many people died in building the Great Wall. We 53can say that it was built
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