。。。。to gauge the effect that this had on a range of issues relating to education

Question

这里that和后面的句子是修饰谁的？effect吗？on是什么作用呢？ 是had \on a range还是had on \a range 求解释 原句是It compared children born in September – at the start of the academic year – to those with birthdays in August to gauge the effect that this had on a range of issues relating to education 。

Answer 1

that引导的是一个从句，后面的整句话用来修饰effect的。
on没有什么作用，on
a
range
of是一个固定搭配，一系列的意思。
on
a
range
of
issues
relating
to
education
这句话连在一起翻译就是一系列与教育有关的问题