life was hard at that moment but we were —— A surviving B survived C to survive D survival选c 为什么用过去将来时?

life was hard at that moment but we were —— A surviving B survived C to survive D survival选c 为什么用过去将来时?
life was hard at that moment but we were —— A surviving B survived C to survive D survival
选c
为什么用过去将来时?

life was hard at that moment but we were —— A surviving B survived C to survive D survival选c 为什么用过去将来时?
句意：虽然那时生活困难,但我们活了下来.
选A

从语法上来说其他3个都不对啊
也许句子是想说在那段时间我们一直生存了下来