yes u can, u didn't require visa while entering from usa..
If you leave Canada and want to return, you must have:
a valid passport or travel documents
a valid study permit if you are returning to study in Canada and
a valid temporary resident visa if you are a citizen of a designated country for which Canada requires a visa.
If you are a citizen of a designated country and you travel to a country other than the United States, Greenland or Saint-Pierre et Miquelon, you will need a multiple-entry visa to re-enter Canada. If your temporary resident visa has expired or if your visa was only valid for a single entry, you must re-apply for a temporary resident visa at a Canadian visa office outside Canada before you can re-enter Canada.