The researcher could hardly find enugh evidence____his arguments in favour of the new theoryA to be based on B to base on C which to base on D on which to base

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Theresearchercouldhardlyfindenughevidence____hisargumentsinfavourofthenewtheoryAtobebasedonBtobaseon

The researcher could hardly find enugh evidence____his arguments in favour of the new theoryA to be based on B to base on C which to base on D on which to base
The researcher could hardly find enugh evidence____his arguments in favour of the new theory
A to be based on B to base on C which to base on D on which to base

The researcher could hardly find enugh evidence____his arguments in favour of the new theoryA to be based on B to base on C which to base on D on which to base
选D,介词+which+to do 作定语,相当一定语从句,介词+which作不定式的时间,方式等状语
he had no money with which to buy some gifts for his girlfriend
spring is the best season in which to go spring outing.
A to be based on尽管表示被动,但表将来.应该用based on表被动和完成

因为证据要被依靠,所以要用被动,选项里只有A被动,所以a

答案是A
(which/that) to be based on