【正文】
Not until all the fish died in the river, ____ how serious the pollution was. (MET 95) A. did the villagers realize B. the villagers realized C. the villagers did realize D. didn’t the villagers realize B A 5. Only in this way ____ do it well. A. must we B. we could C. can we D. we can 6. Hardly ____ when it began to rain. A. had he arrived B. arrived he C. he had arrived D. did he arrive 7. Not until the bell rang ____ in. A. do they e B. came they C. did they e D. they came 8. Only when class began ____ that he had left his book at home. A. will he realize B. he did