I made a phone call to you without an answer last night,you ______英语解答

I made a phone call to you without an answer last night,you _____ out at that moment.
A) might be B) must have been C) must be D) were

人气：131 ℃　时间：2019-11-21 12:45:51

解答

must be一定；一定要；肯定是
-might be：可能是可能是
must have been一定（对过去事实肯定的推测）
were 是
因此只能是B,表示对昨天他不在的这个事实的推测.