问题1选项
A.No matter how he might pass the examination
B.Whether he passed the examination or not
C.Though he might pass the examination
D.While he passed the examination
考查主语从句。句意:他考试及格与否不关我们的事。横线部分为主语从句。B选项Whether he passed the examination or not中whether…or not“无论,是否”,符合题意。A选项No matter how he might pass the examination去掉might选项符合语法,翻译成:无论他怎样通过考试。C选项Though he might pass the examination中though“尽管”,引导让步状语从句,不符合语境。D选项While he passed the examination中while“当……的时候”,引导时间状语从句,不符合语境。因此B选项正确。