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  • 科目:英语
  • 题型:单选题
  • 难度:较易
  • 人气:1779

-----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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Whathappenedhereyesterday?Anad