He has been so hard working. He ___ failed in the exam.
A: couldn't have
B: wouldn't have
C: mustn't have
A: couldn't have
B: wouldn't have
C: mustn't have
举一反三
- He has been so hard working. He ___ failed in the exam. A: couldn't B: mustn't C: wouldn't
- Michael failed the exam. He（）have spent so much time playing computer games and chat-ring online. A: mustn’t B: couldn’t C: wouldn’t D: shouldn’t
- Most of the students failed in the final exam. It ______ easy. A: can't be B: shouldn't be C: mustn't have been D: couldn't have been
- He（）the train if he hadn't been stack in traffic jam on the way to the railway station. A: couldn't miss B: wouldn't have missed C: mustn't have missed D: shouldn't miss
- If Tom______too careless in the final exam, he______a make-up exam. A: was; couldn’t have taken B: hadn’t been; couldn’t take C: hadn’t been; couldn’t have taken D: have not been; couldn’t have taken