问sat oc里面的一道题oc 第六套section5十八题,Jean Toomer was not only the

问sat oc里面的一道题
oc 第六套section5十八题,Jean Toomer was not only the author of Cane ,a novel whose publication has been viewed as marking the beginning of the Harlem Renaissance ,but also a respected advisor among Quakers.
答案说没有错,我选的是c（as marking),我问了一个外国人也说c错了,求指点!