My friend came to my home last night .But it happened (1)that I was about to go out.(1)为什么用that,不用when

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My friend came to my home last night .But it happened (1)that I was about to go out.(1)为什么用that,不用when
My friend came to my home last night .But it happened (1)that I was about to go out.
(1)为什么用that,不用when

My friend came to my home last night .But it happened (1)that I was about to go out.(1)为什么用that,不用when
it happened that 固定用法,表示正巧.的意思

不是"发生在我出去的时候".而是"不巧的是,我出去了."懂?...

(1)中的about to go out 就是有问题,应该成about going out。
可以用when啊,从句的导语不是固定的