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Both the caribou and the reindeer belong to the species Rangifer tarandus, but after 7,000 years of domestication in Eurasia, reindeer have developed a tendency to circle in tight groups, while caribou tend to spread far and wide.
答案:A
问题:错选了D 查看答疑
问题:请金老师回答,A选项while前后不应该是一样的时态吗?现在完成时可以和一般现在时并列吗? 查看答疑

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