When climbing the hill John was knocked unconscious by an rolling stone. [ ] A.u
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![When climbing the hill John was knocked unconscious by an rolling stone. [ ] A.u](/pic/43_977429.jpg)
When climbing the hill John was knocked unconscious by an ________ rolling stone.
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A.untouchedB.unexpectedC.unfamiliarD.unbelievable试题答案
答案:B