Mr. Hall understands that ______ maths has always been easy for him, it is not easy for the students.

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问题 Mr. Hall understands that ______ maths has always been easy for him, it is not easy for the students.

选项 A、unless
B、since
C、although
D、when

答案C

解析 本题中的两个从属连词that和although,that引导宾语从句,although引导宾语从句中的状语从句。
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