项目后评价的效益预测是以( )为起点的。
A．工程建成 B．技术建成 C．经济建成 D．评价时点
参考答案：D
按括号内的要求完成句子。（每题一分）
小题1:She has a tennis racket. (改为一般疑问句)
she a tennis racket?
小题2:Sally and Tom eat some vegetables every day. (改为否定句)
Sally and Tom eat vegetables every day.
小题3: We are in Beijing. （就划线部分提问） ________ ________ we?
小题4:That is an English book in the desk. （变为复数句）
________ are English ________ in the desks.
小题5:We can go to his party. （改为否定句）
We ________ ________ to his party.
试说明通信线路工程中，哪些情况下应埋设光、电缆标石？
