I am enrolled in an on-line graduate course (US public university). I do not live near the campus, so I cannot attend office hours (which aren't even offered).

For 3 months, I've been working on a research paper for the course. At regular deadlines, I've submitted my progress electronically, however, the instructor's feedback was sparse in each case:

• No feedback on whether my chosen topic was okay.
• No replies to my public posts/E-mails about some concerns I had in approaching the topic.
• Only minimal markings, e.g. pointed out a few grammar/MLA mistakes, no comments focused on my ideas, organization, etc.

I do not even know if the instructor read my work. The project is worth a significant portion of the course grade, but the instructor has given such little input and I have no idea if the paper is good or terrible. What can I do?