Here's the answer:
“今年はもうお花見に行きましたか?”
(kotoshi wa mō o hanami ni iki-mashita ka?)
Watch a real native speaker say it:
Here's how it sounds in a textbook:
You could also say:
- 今年はもう花見に行きましたか?
Fun fact: the hundreds of thousands of people learning Japanese with Memrise get this phrase correct 95.77% of the time!