问题补充：
the Forbidden City is almost 600 years old, it is still very beautiful.
A. Although; but
B. /; although
C. Although; /
D. Because; so
答案：
A. Although; but
B. /; although
(答案→)C. Although; /
D. Because; so
解析：although与but 不能同时使用，because与so 不能同时使用，再根据题意，选C
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