A: Your bicycle looks very nice. When did you buy it?

B: Oh, I ______ it for three months. It's a birthday present from my uncle. [ ]

A. bought

B. have bought

C. have received

D. have had

房地产开发在初步可行性研究阶段投资误差一般要求在（）以内。

A.10%

B.20%

C.30%

D.40%