Question

I was about to go out ________ it began to rai

I was about to go out ________ it began to rain. A．when　　　 B．as C．since　　　 D．while

Answer 1

A

试题分析：句意：当开始下雨的时候，我正要外出。When当……的时候 as作为 since自从 while然而，选A。