If he ( ) the problem well, he couldn't have solved it.
A: has not studied
B: shouldn't have studied
C: had not studied
D: were not to study
A: has not studied
B: shouldn't have studied
C: had not studied
D: were not to study
举一反三
- _____ , he would have passed the exam. A: If he were to study B: If he studied hard C: Had he studied hard D: Should he study hard
- ________hard, he would have passed the final exam. A: Should he study B: Had he studied C: Has he studied D: Did he study
- He did very badly on the exam. He ______ harder. A: must study B: must have studied C: should study D: should have studied
- __________, he would have been able to pass the exam. A: If he studied more B: If he should study more C: Studying more D: Had he studied more
- He spoke English well. He _____the language for years. A: should have studied B: ought to have studied C: must have studied D: could have studied