题目内容：

why does C harlie think ( )magazines might be a good idea?
A.borrow B.is borrowing c.borrowing d.will borrow

优质解答

“认为...是...”用think短语来表达可说成：
think...(to be)...[to be后加形容词或名词,to be可以省略]
这里只有borrowing
选C