试题题干
Translate the following sentence into Chinese.
After a lot of practice, the dog can retrieve a stick (or other object) even when he has not seen it thrown.
参考答案
试题解析
考点：a lot of practice多次训练；retrieve找回； stick棍子； object物体，东西。
句子结构：After a lot of practice为状语，主句为the dog can retrieve a stick，even when···为让步状语从句。