[单选题,8.3分] The scientist could hardly find sufficient grounds ______ his arguments in favor of the new theory. A. which to base on B. to base on C.to be based on D.on which to base

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[单选题,8.3分] The scientist could hardly find sufficient grounds ______ his arguments in favor of the new theory.
A. which to base on
B. to base on
C.to be based on
D.on which to base

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