问题补充：
In the USA, Thanksgiving Day is a harvest festival. Traditionally, it is time to give thanks for the harvest and express gratitude in general.
A. the; a
B. /; the
C. /; a
D. the; the
答案：
A. the; a
B. /; the
(答案→)C. /; a
D. the; the
解析：句意：在美国，感恩节是个收获的节日，传统上，它是一个对收获表示感谢和感激的时间。第一空不填，Thanksgiving Day：感恩节前面不加the，第二空填a，泛指“一个时间”，选C。
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