____ in a branch of the tree ___ a note which read "I'll meet you at the School Gate"．

A．Sticking; was there

B．Stick; was there

C．To stick; was

D．Stuck; was

国民经济费用中的直接费用是指( )。

A．由项目产出物直接生成，并在项目范围内计算的经济效益

B．项目使用投入物所形成，并在项目范围内计算的费用

C．项目对国民经济做出的贡献

D．国民经济为项目付出的代价