_______ the calculation is right, scientists can never be sure that they have included all variables and modeled them accurately. 

 A. Even if        B.  As far as       C. If only     D.  So long as

A


解析:

根據(jù)句意填A(yù)。句意為：即使這個計算是正確的，科學(xué)家們也永遠(yuǎn)不能確定他們已經(jīng)包括了所有的變數(shù)情況以及精確地對其進(jìn)行了模擬。

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