According to the air traffic rules, you _______switch off your mobile phone before boarding.
- A、 may
- B、 can
- C、 would
- D、 should
正确答案:D
答案解析:有
微信扫一扫手机做题
According to the air traffic rules, you _______switch off your mobile phone before boarding.
微信扫一扫手机做题