—Some Chinese students find it hard to adapt to the life when in London.

—Exactly, ______ they've learnt a lot about the city before.[ ]

A. if only      

B. now that    

C. as though      

D. even though

可行性分析是在进行下述哪项后所进行的对系统开发必要性和可能性的研究，所以也称可行性研究

A．资源保证

B．进度控制

C．初步调查

D．计划调整