1) He has never been somewhere by air.
2) He has never been on an airplan.
3) He has never taken an airplan.
4) He has never flown anywhere by air.(by airplan)
以上全都对,
有问题还可以再问
1) He has never been somewhere by air.
2) He has never been on an airplan.
3) He has never taken an airplan.
4) He has never flown anywhere by air.(by airplan)
以上全都对,
有问题还可以再问