A until 后面从句用的是完成体,强调某一动作已经完成,主句是一般现在时指的是一般/客观状况,所以从时间顺序上说,从句在前,主句在后.所以意思大致应该是“在我们已经得到（某个）教训之前,我们很难在生活中汲取教训.（先有教训,然后才会汲取,在这之前,那是很难或者不可能的）”B是指有教训之后了,C四完成体标志语,从有教训开始到现在,D当有教训的时候,姑且不谈语法,就是从意思上就不符合.
所以,应该选A
It is difficult for us to learn a lesson in life___we've act
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