It was not until 1920 _____ regular radio broadcasts began.
举一反三
- It was _____ his mother came in ______ to prepare his lessons. A: not until；did the boy begin B: until；that the boy began C: until；did the boy begin D: not until；that the boy began
- （）, she began to search some on TV. A: There were so no interesting radio programs B: There was no interesting radio programs C: Without being interesting radio programs D: There being no interesting radio programs
- Not until I began to work ____ how much time I had wasted.
- I don’t know how many years ago _______people began to stay at home and civilization began. A: it was when B: it was that C: was it that D: was it when
- The custom of observing the double ninth day didn’t become regular until the Tang Dynasty.