The Great Pyramid is said to ________by aliens. Is there a chance that this might be true?

[ ]

A. be built      

B. have been built

C. being built        

D. built

信息系统开发的技术可行性主要考虑的内容除硬件、软件的功能、性能以外，还有

A．开发商的能力和信誉

B．咨询商的经验和素质

C．技术人员的素质和水平产品

D．先进性和成熟性