Have you sent that letter off yet? There's something important I'd like to add _____ it. [ ]

A. up

B. to

C. /

D. with

根据《通信建设工程监理管理规定》编写监理规划应按照（）的要求

A.合同

B.建设单位要求

C.工程建设强制性标准及相关监理规范

D.监理单位单位规定