摘要： What happened here yesterday? -An adventurer was walking at the foot of the mountain suddenly a stone fell and hit him on the head. A.where B.while C.how D.when
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-----What happened here yesterday?
-----An adventurer was walking at the foot of the mountain ______ suddenly a stone fell and hit him on the head.
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-----What happened here yesterday?
-----An adventurer was walking at the foot of the mountain ______ suddenly a stone fell and hit him on the head.
| A.where | B.while | C.how | D.when |