The question is very important. It really needs _______.

A．carefully discussing 　

B．carefully to discuss

C．to carefully be discussed

D．being discussed carefully

工程咨询公开招标程序采用公开招标方式的招标文件包含的内容有( )。

A．招标人须知

B．招标人年龄

C．招标公告

D．委托服务范围

E．拟签订的合同条款