—My son is lost . Have you seen a boy passing by here?

—I saw        boy hidden behind          tree over there . You may go and have a look.

A．a; the

B．the; the

C．a; a

D．the; a

保证项目按设计和计划的进度、质量、投资预算顺利实施建设，最后达到预期的目标和要求是项目( )的咨询任务。

A．前期阶段

B．准备阶段

C．实施阶段

D．运营阶段