Theearlystowawayssworetheirallegiancetothenationandreceivedtheirnaturalizationpapers.

参考答案:

D

名词辨析, allegiance表忠贞，效忠；A. epithet绰号，称号；B. monition忠告，警告，传票；C. immensity广大，无限，浩滿；D. loyally忠诚，忠心；因此D为答案。