We each has to hand in a paper on the topic of environment before the end of this term.
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【正确答案】 1、正确答案：has—have    
【答案解析】解析：考查主谓一致。each置于所修饰词后面时，整个主语看做复数形式，谓语用复数。而each of us则看做单数形式，谓语相应地应该用单数形式。例如：Each of us has something to say。