He has been so hard working. He ___ failed in the exam.
A: couldn't
B: mustn't
C: wouldn't
A: couldn't
B: mustn't
C: wouldn't
举一反三
- He has been so hard working. He ___ failed in the exam. A: couldn't have B: wouldn't have C: mustn't have
- 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
- He failed the exam, ______ proved that he hadn’t been working hard enough. A: [A] that B: which C: what D: of which
- He didn’t study hard, _____ he failed in the exam. A: so that B: in order that C: if
- 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