( )是建设项目管理的核心。
A．建设项目法人责任制
B．建设项目资本金制
C．建设项目招标投标制
D．合同制
参考答案：D
Sandy could do nothing but ______ to his teacher that he was wrong.
A．to admit
B．admitted
C．admit
D．admitting
双线期
