Mr. Hall understands that _______ math has always been easy for him，it is not easy for the students．A.unlessB.sinceC.althoughD.when
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C解析该题考查连词在宾语从句中的用法。观察题干Mr. Hall understands是主句，其后有that引导的宾语从句，可将该句简化为：_______ math has always been easy for him, it is not easyfor the students.分析简化后的句子可知，math has always been easy forhim与it is not easy for thestudents之间含有转折关系，其他选项不合题干逻辑。