Had electronic computers not been invented, many problems of space flight ______.
could not have been solved
举一反三
- If computers ______, many problems on space flight could not have been solved. A: had not been invented B: are not invented C: were not invented D: have not invented
- All flight ____ because of the snowstorm, many passengers could do nothing but stay at the airport. A: had been cancelled B: were cancelled C: having been cancelled D: have been cancelled
- Electronic computers, which have many advantages, can not carry out creative work and replace man.
- When I was (at) the grocery store, I (realized) that the prices of (many items)(had been() risen). A: at B: realized C: many items D: had been risen
- John was late for the business meeting because his flight had been delayed by coronavirus.
内容
- 0
When we arrived at the airport, we were told our flight ______. A: had cancelled B: had been cancelled C: has been cancelled D: cancelled
- 1
How many Americans had been killed by AIDS?
- 2
It was difficult to ________ how many trees had been destroyed.
- 3
How many years had Rip been asleep?
- 4
If the personal computer had not been invented, will the information age have arrivied by other means? A: 正确 B: 错误