As the most acute one in history of all epidemics, the Spanish Flu had tendency to strike the young and fit rather than the old.
A. 不填；the
B. 不填; a
C. the; 不填
D. the; a
网友回答
A. 不填；the
B. 不填; a
C. the; 不填
(答案→)D. the; a
解析：考察冠词。第一空用the特指all epidemics的历史；第二空是固定词组have a tendency to do sth有做某事的倾向。故D正确.