单选题 《复合题被拆开情况》Tracey: Don’t you have air-conditioning in your apartment? It’s sweltering here!Alice: Well, there’s air-conditioning. Did you see that window air-conditioner there?【D5】________Tracey: I guess not, huh.Alice: Well, I’m going to move out anyway. The new apartment has central air-conditioning.Tracey:【D6】________Alice: Well, I had to wait until the lease expired. So…Tracey:【D7】________Alice: Well, I open the windows and…and I’ve got an electric fan here. It helps a little.A. This summer is unexpectedly hot.B. So how can you stand the heat?C. The problem is that the window unit is not powerful enough.D. You should’ve moved out long, long ago. 《问题》：【D7】