问题
选择题
When climbing the hill John was knocked unconscious by an _____ rolling stone. [ ]
A. untouched
B. unexpected
C. unfamiliar
D. unbelievable
答案
答案：B
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When climbing the hill John was knocked unconscious by an _____ rolling stone. [ ]
A. untouched
B. unexpected
C. unfamiliar
D. unbelievable
答案：B