— Tom hasn't turned up yet. He might have got lost.

— No, he ________. His car has got a GPS.[    ]

A. must not have got lost  

B. wouldn't have got lost

C. can't have got lost  

D. shouldn't have got lost

提高电力系统静态稳定性的根本措施是（）。

A.缩短电气距离；

B.提高备用容量；

C.增加线路长度；

D.提高系统电压。