为什么you should understand the traffic rule by now you have had itexpiainde often enough 中要用expiainde而不能用to explain
问题描述：
为什么you should understand the traffic rule by now you have had it
expiainde often enough 中要用expiainde而不能用to explain
答
不明白
答
sth explained
sb want to explain
比较顺口
答
have sth done的结构，再如：
I had my bike repaired today.
希望对你有帮助
答
被讲解了很多遍，要用被动语态
答
从整个句子分析来看,后面的you have had it explained often enough句中存在这样的句型：have had it explained.忽略掉过去完成时have done结构,我们有have it explained,即have sth done结构,表示某事已经被完成.如...