bill's and sam's project __are__about yogurt
bill's and sam's因为两个人名都加了's这说明是两个不一样的 所以主语不是单数 be动词要用复数
bill and sam's project __is__about yogurt
这样就是is了
bill's and sam's project ____about yogurt
bill's and sam's project ____about yogurt
写错了bill's and sam's projects ____about yogurt。用are both 还是both are
写错了bill's and sam's projects ____about yogurt。用are both 还是both are
英语人气：215 ℃时间：2019-11-06 23:47:29
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