一、单项选择（共15小题；每小题l分，计15分）
在下列各题A、B、C、D四个选项中选择一个能填入题干空白处的最佳答案。
1. --- Jim took one-hour ride just now. What a short time he spent finishing such a long way!
--- He is _____ experienced rider.
A. an; the B. an; a C. a ;an D. a; the
2. --- Do you know when he tomorrow?
--- Don’t worry. I think as soon as he , he will give you a call.
A. will come; will come B. will come; comes
C. comes; will come D. comes; comes
3. There are so many kinds of Mp4 in the shop. We can’t decide .
A. what to buy B. to buy what C. which to buy D. to buy which
