从人体健康和生命安全的角度考虑，下列做法正确的是[ ]

A. 在汽车加油站吸烟

B. 远离毒品

C. 携带白酒乘车

D. 酒后驾车

—Your colleague is speaking English with fluency.

—It's no wonder．She ____ in the UK for a year as a visiting professor

A．worked

B．has worked

C．had worked

D．has been working