________ the calculation is right, scientists can never be sure that they have included all variables and modeled them accurately.
A．Even ifB．As far as
C．If onlyD．So long as
A
A 考察，從。Even if即使，縱然；引導讓步狀語從句。句義：即使計算結(jié)果正確，科學家也無法肯定他們已經(jīng)把所有的變量都包括進去并進行了準確的模擬。根據(jù)句義說明A正確。
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