Before the first non-stop flight made in 1949, it______necessary for all planes to land for refueling.
举一反三
- Before the first nonstop flight made in 1949, it_______ necessary for all planes to land for refueling.
- 中国大学MOOC: The chairperson makes sure all the necessary arrangements are made before the meeting.
- The chairperson makes sure all the necessary arrangements are made before the meeting. A: 正确 B: 错误
- FAs (flight attendants ) need to get the flight assignment first before going to the airport.
- It won’t be long before we ______ such planes ourselves. A: will have made B: have made C: are making D: will be making