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为什么which之前要加andIfoneofthemwasdestroyed,itisdifficulttorestoreittotheoriginalshape,andwhichisagreatlosttothecountry.为什么which之前要加and

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为什么which之前要加and
If one of them was destroyed,it is difficult to restore it to the original shape,and which is a great lost to the country.为什么which 之前要加and
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个人意见:
如果不加and则which 所引导的从句就成了解说 original shape的了
加了and则表示which所引导的从句和前面的it is difficult to restore it to the original shape是并列的,都是解说if one of them was destroyed的,这样才符合原文所表达的意思.