Iwasabouttophonehim________heapp

发布时间：2020-07-26 02:58:43

I was about to phone him ________ he appeared at the door.A.whileB.asC.whenD.then

网友回答

C解析句型be about to do when…，when＝and at that time引导并列分句．
以上问题属网友观点，不代表本站立场，仅供参考！