I was reading a book at home.the telephone rang.

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I was reading a book at home.the telephone rang.
I was reading a book at home.the telephone rang.

I was reading a book at home.the telephone rang.
I was reading a book at home,when the telephone rang (= 当时我正在家看书,电话铃响了);
后面的 rang (ring 的过去) 是瞬间性动词,最好用 when ,而不用 while / as ;
when 在这里讲是从属连词,倒不如说是并列连词,相当于 at that time / at that moment.