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  • 科目:英语
  • 题型:单选题
  • 难度:中等
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【2015•湖南】That's why I help brighten people's days. If you ________, who's to say that another person will?

A.didn't B.don't
C.weren't D.haven't
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【2015•湖南】ThatswhyIhelpbrighten