I set up email addresses for connecting with my parents last May. But I didn’t write to them as often as I ______.

A．should

B．must have

C．should have

D．must

在传统方法中对开发完成后的价值以及后续的开发成本、管理费用、销售费用、销售税费等的测算，主要是根据未来的房地产市场状况作出的。( )