单选题 The United States National Labor Relations Board is authorized to investigation allegations A B of unfair labor practices on the part of either employers or employees. C D

【正确答案】 B

【答案解析】Key：B 分析：考点是动词不定式。is authorized to 是个动词不定式，其后接动词原形。 B错。改正：to investigation ? to investigate 参考译文：无论是雇主或是雇员对各自非正当劳务做出的辩解，美国国家劳工关系委员会都有权开展调查。