题目

As a graducate in computer science, he ___ to work out the problem. A. wouldn't have failed  B. can't have failed  C. mustn’t have failed  D. might not have failed 答案：B 解析: can’t/couldn't have done表示对过去发生的事情的否定推测。Hawk is talking ________ a friend.They are talking ________ English. (　　)A. with; withB. with; inC. in; in