.Not until he left his home________to know how important the family was for him.

A.did he begin                    B he begins                C.he began                D.he has began

我国招标投标法规定，评标应由（）依法组建的评标委员会负责。

A.地方政府相关行政主管部门

B.招标代理人

C.招标监管机构

D.招标人