A、Eighteen months. B、Twelve months. C、Six months. D、Fifteen months. A信息明示题，女士说自己在阿德莱德待了一年，又在悉尼待了六个月，故选A

M: Sara, I’ve heard that you want to move into a homestay family. Is that correct?
W: Yes, that’s fight, I’ve been staying with my aunt. Now my cousin is arriving from Singapore and my aunt needs the room for him.
M: Oh, that’s bad luck. Well, I’ll need to get some particulars first. Sara, what’s your full name?
W: Sara Lim, and that’s Sara without the "h" at the end.
M: Mmm. How old are you, Sara?
W: 23, only just. It was my birthday on the 21st of August.
M: Happy Birthday for yesterday. How long have you been in Australia?
W: A year in Adelaide and six months in Sydney. I prefer Sydney, and I’ve got more friends here.
M: What’s your address at your aunt’s house?
W: Flat one, 539 Forest Road, Canterbury. And the post code is 2036.
M: OK. What are you studying now?
W: I was studying General English in Adelaide and now I’m doing Academic English, because I’m trying to get into Medicine next year.
M: That sounds good, but it’ll take you a long time. When would you like to move out from your aunt’s?
W: My cousin arrives on Friday morning, so I’d better be out on Thursday.
M: Is that the seventh of September?
W: Yes, that’s right.