I ________ out when the telephone rangA happen B happened C happen to D happened to be 请说明为什么?

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I ________ out when the telephone rangA happen B happened C happen to D happened to be 请说明为什么?
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I ________ out when the telephone rangA happen B happened C happen to D happened to be 请说明为什么?
I ________ out when the telephone rang
A happen B happened C happen to D happened to be
请说明为什么?

I ________ out when the telephone rangA happen B happened C happen to D happened to be 请说明为什么?
D
happen to do sth 恰好要做某事,正好/刚好要做某事
电话响的时候,我刚来出去.
因为rang 用的过去时,所以用happened

happened
happened是碰巧发生的意思,不及物动词,后面加宾语的时候才要加to,而本句中out是副词
翻译:电话铃饷的时候我碰巧出去了

选D,因为happen to 表示碰巧的意思,后面加系统动词be连成完整句子.
整句意思为:当电话响的时候正好出去了.

D