C) acquire
由句意可以做出选择。
如果人们觉得无望了,他们就不会再费心去__获得成功所需要的技能。
acquire是获得、学到的意思 to come to have as a new or added characteristic, trait, or ability (as by sustained effort or natural selection)
比如说 We must work hard to acquire a good knowledge of English.
我们必须用功学习才能精通英语。
而require是需要、要求、命令;
inquire是询问、问明、查究;
enquire是询问。
放到句子里意思不符。
温馨提示:答案为网友推荐,仅供参考