Who is Lily and Lucy?还是Who are Lily and Lucy?
问题描述：
Who is Lily and Lucy?还是Who are Lily and Lucy?
答
问两个人就是are,问一个人就是is了。Who are Lily and Lucy? Who is Lily or Lucy?
答
are、在这里Lily and Lucy是一个集体
答
Who are Lily and Lucy?这里用的是and,不是or,1+1>2,用复数.