The rich man ______ much food_____ the poor families during the hard time.

A．provides, to

B．provides, with

C．provided, with

D．provided, for

根据FIDIC《施工合同条件》，施工合同的有效期为自合同订立之日起至（）之日止。

A.竣工移交

B.工程师签发工程接收证书

C.工程师颁发履约证书

D.结清单生效