-- The thread of my kite broke and flew away.--I had told you it would easily break _____ it was

the weakest.A.that B .in which C where.D.when请问这道题为什么选C呢？读起来有点奇怪啊。如果改成介词+关系代词应该怎么改呢？谢谢！

--The thread of my kite broke and flew away
.--I had told you it would easily break _____ it was the weakest.
A.that B .in which C where.D.when

这道题，的确有些难度。我们来分析。

I had told you ,tell sb. sth, 这里的sth，是由it would be easily break 来担当的，所以这里是一个宾语从句。
接下来，看这部分。
it would easily break ___it was the weakest.
这两句话之间，不符合宾语从句关系，也不符合定语从句关系，而是什么呢？状语从句。
也就是说，在风筝线最弱的地方，是最 容易断的。所以，这里是一个地点状语从句，只能选择C, where.

where=in which 定语从句 哪容易破