Have you finished the book?- No I’ve read up to the children discover the secret

问题补充：

--- Have you finished the book?

--- No, I’ve read up to the children discover the secret cave.

A. in which

B. what

C. that

D. where

答案：

A. in which

B. what

C. that

(答案→)D. where

解析：考查状语从句。句中where引导地点状语从句，表示“……地方”。句意：——你读完书了吗？——没有，我刚读到孩子们发现秘密岩洞的那个地方。