It worries the couple a lot ______ their only son is behaving worse and worse th
问题描述：
It worries the couple a lot ______ their only son is behaving worse and worse th
It worries the couple a lot ______ their only son is behaving worse and worse these days.
B.why C.that 选C
答
定语从句,用that指代前文的it,不影响句子意思,给你举个类似例子吧,It surprises me a lot(that)he is only 13