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
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(答案→)A. Even if
B. As far as
C. If only
D. So long as
解析：根据句意填A。句意为：即使这个计算是正确的，科学家们也永远不能确定他们已经包括了所有的变数情况以及精确地对其进行了模拟。