His business prospered and he became a person of means. Yet, despite his great riches, he gave no arms to the needy and no thanks to his benefactors whose savings （） to his welfare.

A. had contributed

B. contributed

C. were contributed

D. did contribute

ZXA10 C220的19D06H20机柜和19D06H22机柜具有（）、安装简单、（）、（）、（）、通风良好、外形美观等特点。

A.容量大

B.走线方便

C.监控功能齐全

D.抗干扰能力强