而GWD中有这样一道题: A mixture of poems and short fiction, Jean Toomer's Cane has been called one of the three best novels ever written by a Black American—(the others being Richard Wright's Native Son and Ralph Ellison's Invisible Man.) 括号里是不是个独立主格结构?如果存在nn形式的独立主格,那个being完全没必要存在呀。