A．unknown reasons.B．a training flight.C．the training fo……

单项选择题A．were allowed to work unimpeded.B．were forbidden to work at all.C．were asked to leave.D．were promptly detained.

填空题isolation

单项选择题A．full parking facilities.B．leaving his car in the U. K.C．having his car serviced.D．hiring a car abroad.

填空题react

单项选择题With regard to speech variety, sociolinguists are particularly interested in all the following EXCEPT