编码由一系列符号和数字组成，编码工作是信息处理的一项重要的基础工作，下列编码正确的是( )。

A．项目的结构编码

B．项目的线性组织编码

C．项目的工程编码

D．项日的工程编码

E．函件编码

If I were on the spot that day, I should be able to prevent the disaster to happen.

A. I should be able to prevent the disaster from happening.
B. I should have prevented the disaster to happen.
C. I would have been able to prevent the disaster from happening.
D. I would be able to prevent the disaster to be happened.