Material abundance has been the life blood which has ____ Americans in their basic beliefs and values.
A、contributed
B、provided
C、sustained
D、favored
【正确答案】：C
【题目解析】：物质丰富的生命力使美国人保持他们的基本的信仰和价值观。A有助于，贡献（contribute的过去分词） B提供；给予（provide的过去式） C维持（sustain的过去式和过去分词）；承受 D赞成；宠爱；帮助（favor的过去分词）；给…以恩惠
