I don't know the reason why he did't come to the meeting yes

I don't know the reason why he did't come to the meeting yes I don't know the reason why he was absent yesterday.reason后面 I don't know __.A.the reason why can be B.why the reason may I know nothing about the reason ,_____ he didn't come to the I don't know the reason -------- he cried Athat Bwhy why didn't alice come to the party last night?I don't know w why didn't alice come to the party last night? I don't know I don’t know the reason why he said these words.里面的why引导的从句是 The reason why he didn’t attend the meeting is that he was i I don't quite know the reason _______ he explained to me I don't quite know the reason _______ he told it to me I don't know when he will have the meeting 同义句 I don't know