乌鲁木齐五十二中
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  • 科目:英语
  • 题型:单选题
  • 难度:中等
  • 人气:1387

The professor can hardly find sufficient grounds     his argument in favor of the theory.

A.which to base on
B.on which he bases
C.to base on which
D.which to be based
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The professor can hardly find