一根完整的股骨是一个（　　）

A．细胞

B．组织

C．器官

D．系统

—Why didn't you come to my party? I was so disappointed at your absence.

—I'm very sorry. I ________ but I had a visitor at the last minute.[ ]

A. would like have  

B. would like to

C. had planned to  

D. were going to