2. While the theory initially faced skepticism, subsequent experiments helped to _____ its credibility.
(A) deceive
(B) interrupt
(C) substantiate
(D) acquaint
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統計: A(0), B(0), C(19), D(1), E(0) #3792835
統計: A(0), B(0), C(19), D(1), E(0) #3792835