the man has kept this cat 【since last year】.划线提问 为

问题补充：

the man has kept this cat 【since last year】.划线提问 为什么用How soon

答案：

这里应该用how long提问啊

how long has the man kept this cat 怎么会用how soon呢?

======以下答案可供参考======

供参考答案1:

since回答,用how soon提问

供参考答案2:

since + 点时=段时；对段时间提问用how long .