老师我想问一下：如此的having done 形式的分词作状语，主句的时态是什么时态？
Having gone through a phase of racial discrimination,the United Statesof American today recognizes four races in the country.
这句话为何是recognizes 而不是recognized?
第二个句子:The moon havingrisen, they took a walk in the fields. 这里为何主句用的是过去时态took?
用 having done 形式的分词作状语，主句的时态并未必要用一般过去时，依据语境的需要完全可以用目前时甚至以后时。如：
Having cooked the meal, they began to eat. 做好了饭，他们就开始吃了起来。（针对过去状况）
Having completed the first stage, you can move on to step 2. 第一阶段完成后，你就能接着进行第二步了。（针对目前状况）
Having lived here for many years, he knows everybody here. 由于在这里生活了多年，他认识这里的每个人。（针对目前状况）
Having wetted by licking it the paper covering the window，I will break itin order to see what he is doing in the study. 我把窗户纸舔湿之后，就要戳破它，以便看看他在书房里做什么。（针对以后状况）
