Fortunately , the adventurers brought the GPS with themselves, they might have been lost in the desert.
A. of which
B. without which
C. in which
D. about which
网友回答
A. of which
(答案→)B. without which
C. in which
D. about which
解析：句意：幸运的是，探险者们随身带着GPS，没有它他们可能就会迷失在沙漠中。此处the GPS是先行词，在定语从句中在介词的宾语。故选B。