I was chatting with my mother on the phone __we were suddenly but off .A.when B.who C.where D.why
问题描述:
I was chatting with my mother on the phone __we were suddenly but off .A.when B.who C.where D.why
答
这是固定句式“Sb.was/were doing sth.when sth.happened”的用法,意思是“某人正在做某事的时候,另外一件事情发生了”.