听力原文：M: Excuse me. My watch stopped running and I'm not sure what's wrong with it.
W: Well, let me look at it.
M: OK. It's a new watch. I've only had it for about a year.
W: Hmm. It seems that it just needs a new battery. They only last about a year, you know.
M: Oh, that's a relief. I was hoping it wasn't broken or something. In fact, last week I got some water on it and I was afraid that the water might have mined it. How much is a new battery？
W: It's six ninety-nine plus tax.
M: Oh dear, that seems like a lot. 1 thought my friend said she paid about three ninety-nine for a battery.
W: Well, she may have. But we're a watch repair shop and we install your battery and then guarantee it for a year. If you have the watch cleaned here we guarantee it for an additional three months.
M: Well, I guess you get what you pay for. I'll get my battery here. How long will it take to put it in？
W: Usually I can do it right away, but right now I'm way behind in my repair of a large shipment of watches. They all need to be fixed by this afternoon. Can you leave your watch here until about 5 P.M. ？
M: Oh dear. I'm afraid I can't. I need to get back and I have to work this evening. So I couldn't pick it up by five. And I have to have it by tomorrow.
W: Well, then maybe I can just squeeze it in now. It'll only take a few minutes. Can you wait？
M: OK. I'd really appreciate that. Sure, I'll wait.
W: OK. Just sit down over there. I'll have it fixed in a few minutes.
(20)

A. It needs cleaning.
B. It needs regular servicing.
C. It needs a new battery.
D. It was mined by water.