单项选择题

While（）the gun, the satellite has sent more than four billion bits of information back to earth.

A．having orbited
B．being orbited
C．having been orbited
D．orbiting

<上一题 目录 下一题>
热门 试题

单项选择题
There（）little change in the patient's condition since he was taken to the hospital.

A．is
B．has been
C．have been
D．was
单项选择题
The gray building is where the workers live, and the white one is where the spare parts（）

A．are produced
B．are producing
C．produced
D．being produced
相关试题