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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1092

We know that a smile is usually a sign _____ people feel friendly and happy, but _____ we don’t know who the new person is?

A.that; what if B.when; what
C.when; how about D.if; how
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Weknowthatasmileisusuallyasign