请问新概念3第42课这句话怎么解释?Suddenlytheycametoawaterfallwhichdroppedintoanundergroundlakeatthebottomofthecave.Theyplungedintothelake,andafterloadingtheirgearonaninflatablerubberdinghy,letthecurrentca

Question

请问新概念3第42课这句话怎么解释?
Suddenly they came to a waterfall which dropped into an underground lake at the bottom of the cave.
They plunged into the lake,and after loading their gear on an inflatable rubber dinghy,let the current carry them to the other side.To protect themselves from the icy water,they had to wear special rubber suits.
这句话中,let的主语是谁啊?

Answer 1

they,不是用and连接了,所以就不用重复了.