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  • 科目:英语
  • 题型:单选题
  • 难度:中等
  • 人气:1040

【原创】Mr Smith was _____ flight to New York _____ he remembered he had taken all the family's keys to the doors with him.

A.at; while
B.on; when
C.at a; while
D.on a; when
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【原创】MrSmithwasflighttoNewYorkh