Almost 100 computers ______to us by that key school since the end of last year.

A．have given

B．had been given

C．have been given

D．had given

根据《华润置地物业系统管理办法》要求，新物业项目须在交付后（）内正式启用物业管理系统。

A.1个月

B.3个月

C.6个月

D.12个月