Help with H1B visa application-XiaoBaiTu and others please!

In the DS-156 form, question #31, "Have you ever been refused a U.S. visa?"
Several years ago, I tried to apply for a re-entry visa in Toronto, but the VO requested additional evidence. So, on my passport at the time, the VO stamped "Application Received" and asked me to come back later with the evidence.
Is this considered as "refused"? Or, should I answer the question "Yes" or "No"?
Any response will be greatly appreciated.