Which conjunction is needed to complete this sentence: 'The study found ______ political donations correlated with regulatory outcomes.'
答案解析
核心考点：从句连词使用。
解题思路：动词found后接宾语从句需用that引导陈述句。
选项分析：B. that正确引导陈述性宾语从句；A. which用于定语从句；C. whether表疑问；D. why表原因。
易错点：可能误选which混淆宾语从句与定语从句。
正确答案：B