题目内容
---It must be John who is in the office.
--- I’m sure it ________be John. I saw him off at the airport just twenty minutes ago.
A. won’t B. can’t C. mustn’t D. needn’t
练习册系列答案
相关题目
题目内容
---It must be John who is in the office.
--- I’m sure it ________be John. I saw him off at the airport just twenty minutes ago.
A. won’t B. can’t C. mustn’t D. needn’t