题文
My friend’s flight had taken off _________ I got to the airport to see him off.
| A．while | B．after | C．before | D．until |
My friend’s flight had taken off _________ I got to the airport to see him off.
| A．while | B．after | C．before | D．until |
试题篮
()
粤公网安备 44130202000953号
