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