do your friend help each other哪里错了

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do your friend help each other哪里错了

do your friend help each other哪里错了
do your friend help each other哪里错了

do your friend help each other哪里错了
friend应该用复数,因为each other意思是相互之间,既然是相互之间,就应该是两个人以上,所以应该用复数