Is it too difficult for an immigrant to become successful in business career in Canada? Does it require knowledge of French?

I worked for a couple of weeks in Canada. Specifically Toronto where they speak English. If you act business-like and are successful in the USA you should have no problem doing the same in Canada. Quebec is the main province where French is spoken. Typically the people I met understood both French and English but they did seem to prefer French, although I couldn't speak a word of it.