He didn't attend the meeting for ___ reason. A.a certain B.different C.many D.a some

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He didn't attend the meeting for ___ reason. A.a certain B.different C.many D.a some

A a certain 某一个

选A

因为从语法上，reason 是单数，因此排除BC，那要用复数

如果选D，由于某种原因，但是不需要加a,直接用for some rason