【题目】Donald Trump made a _____ to the nation that he would struggle for lower taxes and improve health care after taking office.
A. contribution B. commitment
C. devotion D. donation
在线课程【答案】B
【解析】
考查名词辨析。A. contribution贡献；B. commitment承诺；C. devotion奉献；D. donation捐赠。句意：唐纳德·特朗普向全国承诺，他上任后将为降低税收和改善医疗服务而奋斗。故B选项正确。