Not until the early years of the 19th century ___ know what heat is. [ ]A. m
题型：专项题难度：来源：
| Not until the early years of the 19th century ___ know what heat is. |
| [ ] |
A. man did
B. man
C. didn"t man
D. did man |
答案
| D |
举一反三
| Not until I began to work ____ realize how much time I had wasted. |
| [ ] |
A. didn"t I
B. did I
C. I didn"t
D. I |
| Many a time _____ swimming alone. |
| [ ] |
A. the boy went
B. went the boy
C. did the boy go
D. did go the boy |
| Only after ____ to go to school. |
| [ ] |
A. New China was founded; he was able
B. was New China founded; was he able
C. New China came into being; was he able
D. New China founded; he was able |
| Little ____ about his own safety, though he was in great danger himself. |
| [ ] |
A. does he care
B. did he care
C. he cares
D. he cared |
| Not until all the fish died in the river ____ how serious the pollution was. |
| [ ] |
A. did the villagers realize
B. the villagers realized
C. the villagers did realize
D. didn"t the villagers realize |
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