—Do you think we should accept that offer?    

—Yes, we should, for we________such bad luck up till now, and time__________out.    [    ]

A. have had; is running    

B. had; is running    

C. have; has been run    

D. have had; has been run

按规范公式计算最终沉降量时，压缩模量的取值所对应的应力段范围可取