<p>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). (No error)</p>
<p>Why is the correct answer (No Error)? </p>
<p>I thought it was (as marking) at first because I thought "marking" is not a noun. (or is it?)</p>
<p>^ Thanks! I think I understand now.
I thought it should be changed to “the mark of” or “a mark of” so publication, a noun, can be parallel with another noun when they are connected by “as”.</p>