_______ the calculation is right, scientists can never be sure that they have included all variables and modeled them accurately. 
A．Even ifB． As far asC．If only D． So long as
A
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行了模擬。
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