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  • 科目:地理
  • 题型:未知题型
  • 难度:容易
  • 人气:1983
题文

 ______, I think, and all the problems could be settled.

A.If you make more efforts
B.Making more efforts
C.A bit more effort
D.To have made more efforts
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,Ithink,andalltheproblemscould