______the calculation is right, scientists can never be sure that they have incl

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

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

答案 A

解析句意：即使计算是正确的，科学家也不能确定他们是否包括了所有的变量，以及建模是否精确。由于后半句为否定句表转折，故填even if，意为“即便；即使”。

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