英语句法本句中的两个had都是神马成分,Inoneofmyclassesweremanychildrenwhohadhadgreattroublewithschoolwork,particularlyreading.本句中的两个had都是神马成分,Manychildrenwhohadhadgreattroublewithschool

Question

英语句法本句中的两个had 都是神马成分,
In one of my classes were many children who had had great trouble with schoolwork ,particularly reading .本句中的两个had 都是神马成分,
Many children who had had great trouble with schoolwork ,particularly reading,were in one ...从句和主句时态是过去完成时和一般过去时，为什么会这样写

Answer 1

这里有一个过去完成时
第一个had是构成里的,必须加
第二个是词组have great trouble
但要用他的过去分词had
所以是had had
这里主句类似没有时态
再说从句时态不受主句影响
我原是最快