答案 ；更多答案，请关注【电大搜题】微信公众号 答案：更多答案，请关注【电大搜题】微信公众号 答案：更多答案，请关注【电大搜题】微信公众号 单选题 1 B-1. I didn't answer the phone _____ I didn't hear it ring. A if B unless C although D because 答案是： 2 B-