at any cost紧急求助

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• do does ； cost costs的用法!1：how much do the carrots cost?the carrots cost three dollars.2：how much does the tea cost?the tea costs two euros.3：how much does a movie ticket cost?a movie ticket costs nine pounds.问：为什么第一句用do,第二句用does呢?为什么第二句和第三句回答中不用cost,而是用costs呢?
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