Ifelt somewhat disappointed and was about to leave,_ something occured which attracted my attentionAuntil Bwhen AB 分不清啊

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Ifelt somewhat disappointed and was about to leave,_ something occured which attracted my attentionAuntil Bwhen AB 分不清啊
Ifelt somewhat disappointed and was about to leave,_ something occured which attracted my attention
Auntil Bwhen
AB 分不清啊

Ifelt somewhat disappointed and was about to leave,_ something occured which attracted my attentionAuntil Bwhen AB 分不清啊
A项的意思是直到,前后两件事不是同时发生.而且前面的事情必须是持续一段时间,直到后面的事情发生后,前面的事情才发生.
B项是正当的意思,前后两件事情同时发生.
所以区分AB的关键就是从意思上判断前后两件事的顺序.
本句意思是,我感到有点失望并且正要离开,就在此时发生的一件事情吸引了我的注意力.
所以得选择B项啊~~
楼主理解了吗,望采纳啊~~

sb. was about to do A/was on the point of dong A when B happened
这是常出现的句型