A、When she had just graduated from her college. B、When she attended a conference in New York. C、When she was studying at a fashi

In the past few months, I’ve been traveling for weeks at a time with only one suitcase of clothes. One day, I was invited to an important event, and I wanted to wear something special for it. I looked through my suitcase but couldn’t find anything to wear.(19)I was lucky to be at the technology conference then, and I had access to 3D printers. So I quickly designed a skirt on my computer, and I loaded the file on the printer. It just printed the pieces overnight. The next morning, I just took all the pieces, assembled them together in my hotel room, and this is actually the skirt that I’m wearing right now.
    So it wasn’t the first time that I printed clothes.(20)For my senior collection at fashion design school, I decided to try and 3D print an entire fashion collection from my home. The problem was that I barely knew anything about 3D printing, and I had only nine months to figure out how to print five fashionable looks.
    I always felt most creative when I worked from home. I loved experimenting with new materials, and I always tried to develop new techniques to make the most unique textiles for my fashion projects.
    One summer break, I came here to New York for an internship at a fashion house in Chinatown. We worked on two incredible dresses that were 3D printed. They were amazing—like you can see here. But I had a few problems with them.(21)They were made from hard plastics and that’s why they were very breakable. The models couldn’t sit in them, and they even got scratched from the plastics under their arms.
    So now, the main challenge was to find the right material for printing clothes with, I mean the material you feed the printer with.(22)The breakthrough came when I was introduced to Filaflex, which is a new kind of printing material. It’s strong, yet very flexible. And with it, I was able to print the first garment, a red jacket that had the word "freedom" embedded into it. And actually, you can easily download this jacket, and change the word to something else, for example, your name or your sweetheart’s name.
    So I think in the future, materials will evolve, and they will look and feel like fabrics we know today, like cotton or silk.
Questions 19 to 22 are based on the recording you have just heard.
19. What does the speaker say about the skirt she is wearing now?
20. When did the speaker start experimenting with 3D printing?
21. What was the problem with the material the speaker worked on at a New York fashion house?
22. What does the speaker say about Filaflex?