问题
选择题
Climbing is one of _____, I think.[ ]
A. the most difficult sport
B. the most difficult sports
C. most difficult sport
D. most difficult sports
答案
答案：B
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Climbing is one of _____, I think.[ ]
A. the most difficult sport
B. the most difficult sports
C. most difficult sport
D. most difficult sports
答案：B