单选题：I would appreciate it________you call back this afternoon fo..

I grew up in Africa. _____ at least I should say that I spent much of the first ten years of my life there. [ ] A. And B. Or C. So D. But

__________ the days went on, the weather got worse.[ ]A. With B. SinceC. WhileD. As

___________ they lack official support, they continue their struggle.[ ]A. Until B. IfC. Though D. Before

It's an old car, it's very reliable.[ ]A. so B. butC. orD. and

I had just started back for the house to change my clothes _____I heard my name called. [ ]A. as B. forC. while D. when