高等教育 / 新发展英语综合教程（二）
It can be inferred from the passage that the Craighead Caverns presently serve as _ _ _ _ .
A.an underground testing site
B.an Indian meeting ground
C.a tourist attraction
D.a motor boat race course
A.an underground testing site
B.an Indian meeting ground
C.a tourist attraction
D.a motor boat race course
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