参考答案：B

解析：[听力原文]19-22
M: So, Susan, do you have anything planned for this Saturday .
W: Uh, I’m kind of busy. Why d9 you ask
M: Oh, I was wondering if you’d like to get together and do something, like catch a movie or take a walk down by the lake.
W: I’d love to, but I’m really going to be busy all day on Saturday.
M: What do you have going on that day .
W: First, my mom asked me to help clean the house in the morning, and then I have a dentist appointment at 12:30. I can’t miss that because I’ve canceled twice before.
M: Well, what about after that
W: Well, I’m going to be running around all day. After the dentist appointment, I need to meet Julie at 2:00 to help her with her science project that’s due on Monday morning at school.
M: Okay, but are you free after that
W: Hardly. Then I have to pick up my brother from soccer practice at 4:30, and my mom asked me to cook dinner for the family at 5:30. I feel like a slave sometimes. Then, I have to clean the dishes and finish reading my history assignment. Who knows how long that’ll take.
M: Wow, sounds like you’re going to have a full day. Hey, listen, why don’t I come over later in the evening, and we can make some popcorn and watch a movie.
W: Oh, that’d he great, but our video machine is broken.
M: Huh. Well, let’s just play a game or something.
W: Sounds good, but give me a call before you come. My mom might try to come up with something else for me to do.
19. What does Susan have to do on Saturday morning

对话中“…my mom asked me to help clean the house in the morning…”可以得知B项“清扫房间”是正确的答案。