I’ve already told you that I’m going to buy a new iPad, _____.

A．how much does it cost

B．however much it costs

C．no matter how it costs

D．however does it cost much

产生软件危机的原因一方面与软件本身的特点有关，另一方面也和( )的方法不正确有关。

A) 软件的使用
B) 软件的成本
C) 软件的文档材料
D) 软件的开发和维护