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
网友回答
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.如果用have it to explain,则表示有某事要去做,但现在还没做.understand?
======以下答案可供参考======
供参考答案1:
被讲解了很多遍，要用被动语态
供参考答案2:
不明白供参考答案3:
sth explained
sb want to explain
比较顺口供参考答案4:
have sth done的结构，再如：
I had my bike repaired today.
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