Question

I did very well on the test, even though I didn't crack a book to study until the night before.

What does the idiom CRACK A BOOK mean?
Close a book
Break a book
Open a book
Lose a book

Answer 1

(Open a book) is the answer to your question.

Answer 2

Open a book. So C would be your answer.

Step-by-step explanation:

They are saying they did well on there test without opening a book. So they did not need extra reading or anything to do well. They just needed to take the test.