A pilot must remain ( ) at all times.
A: various
B: vigilant
C: virtual
D: visual
A: various
B: vigilant
C: virtual
D: visual
举一反三
- The pilot asked all the passengers on board to remain ______ as the plane was making a landing.
- He has to remain _____ (警惕的) at all times as a pilot.
- In the UK, the various national identities all remain the same; many people outside of England self-identify as "British".
- Once in flight, the pilot must take pains to stick to the plan, otherwise getting lost is all too easy.
- How many times have they been to France A: Three times. B: Four times. C: Five times.