In the United States Thanksgiving Day is on fourth Thursday in November.A. the; 不填B. the;

问题补充：

In the United States, Thanksgiving Day is on fourth Thursday in November.

A. the; 不填

B. the; a

C. 不填; the

D. a; 不填

答案：

(答案→)A. the; 不填

B. the; a

C. 不填; the

D. a; 不填

解析：句意：在美国，感恩节是在十一月份的第四个星期四。第四常用the fourth表示，而月份前一般不加冠词；故选A。