2026年2月托福机经套卷(第6套) - Build a Sentence Q4

原题

to return I could to the library it I had before

Why didn't you read the book I recommended? ______ ______ ______ ______ ______ ______ finish it.

参考答案：I had to return it to the library before I could

老师暂未填写解题思路。