In A-version "this" is afloat without a specific antecedent
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郑婷匀
-In A-version "this" is afloat without a specific antecedent. There is no way for the reader to tell just what "we are certain" of. Strictly speaking, the pronoun refers to the preceding sentence and means "we are quite certain that we have this determination."Clearly, that is not the intended sense.

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