题目内容：

The notebook I ____ I_______ is in my school bag
A think lost B thought had lost
C think had lost D thought have lost

优质解答

我本以为丢失的笔记本在我的书包里.
是过去认为笔记本丢失：先丢失,才能认为.所以“丢失”发生在“认为”之前.
“认为”使用一般过去时,那“丢失”就用去完成时表示过去的过去.
thought是一般过去时,had lost是过去完成时