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When the truth of sentence (a) guarantees the truth of sentence (b) , and the falsity of sentence (b) guarantees the falsity of sentence (a) , we can say that______.
A.sentence (a) presupposes sentence (b)
B.sentence (a) entails sentence (b)
C.sentence (a) is inconsistent with sentence (b)
D.sentence (a) contradicts sentence (b)
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