They’ve already made it clear to us that they will never to any difficulty.
A. give up
B. give out
C. give in
D. give away
网友回答
A. give up
B. give out
(答案→)C. give in
D. give away
解析：考查固定词组，give up意思“放弃”，give out意思“分发”，give in意思“投降”，give away意思“泄露”，句子意思“他们很清楚从不向困难低头”