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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1442

It suddenly occurred to him __________ he had left his keys in the office.

A.whether
B.where
C.which
D.that
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Itsuddenlyoccurredtohimhehadle