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

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

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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 本题测试：连词的区分。四个选项的含义分别是：A项even if“即使；即便，哪怕”；B项as far as“(表示程度，范围)就……；至于……”；C项if only“只要；要是……多好”；D项so long as“只要”。根据主句句意：“科学家也永远无法确保……”空格处应选用even if，构成让步从句，意思是：即便计算是正确的，科学家也无法确保……C、D项构成条件从句，不妥。
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