Not until he failed the exam ____ that working hard is important.
A: had he know
B: did he know
C: he knew
D: he had known
A: had he know
B: did he know
C: he knew
D: he had known
举一反三
- 直到他考试不及格，他才知道努力学习很重要。 A: Not until he failed the exam he knew that working hard is important. B: Until he failed the exam did he know that working hard is important. C: Not until did he fail the exam he knew that working hard is important. D: Not until he failed the exam did he know that working hard is important.
- __________ that this region was so rich in natural resources. A: Did he knew little B: Little he did know C: Little did he know D: Little he had known
- ______ that this region was so rich in natural resources. A: Little he knew B: Little did he know C: Little he did know D: Little he had know
- He talks as if he ______ everything. A: know B: knew C: had known D: has known
- Not until he left his home to know how important the family was for him. A: did he begin B: had he begun C: he began D: he has began