用does,你只要记住句子中有了实义动词就不能用be动词,而要用助动词来提问.楼上的 is working也对,他用了现在完成时.我们老师很早以前讲过一句话,一个句子中不能出现两个动词,助动词除外（其实这句话学到后面会发现是错的,比如一些特殊用法,被动语态啊,从句啊,但目前来讲这句话对初学者很有用）.
where is Mr Green work?用is还是用does
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