A search party were armed with the new machine,they went into the cave hoping to find buried treas

题目

A search party were armed with the new machine,they went into the cave hoping to find buried treas
A search party armed with the new machine,they went into the cave hoping to find buried treasure,hoping做什么成分,为什么我觉得是伴随状语呢
他们装备了新的机器,期望发现埋藏的宝藏,课本上说是目的状语,到底谁什么
另外,armed with the new machine为什么用armed,不用arm?

答案