Their car broke down while they in the desert.A. droveB. were drivingC. are drivingD. will

问题补充：

Their car broke down while they in the desert.

A. drove

B. were driving

C. are driving

D. will drive

答案：

A. drove

(答案→)B. were driving

C. are driving

D. will drive

解析：考察时态。句意：当他们正在沙漠中前进时，他他们的车抛锚了。while引导的从句强调主从动作同时发生，结合语境可知从句中用过去进行时态，故选Ｂ。