In the library,I found a useful book____how to use English grammar.答案为hanving explained,为什么

问题描述:

In the library,I found a useful book____how to use English grammar.
答案为hanving explained,为什么

你好。答案应该是on / about 或者是explaining但绝对不是having explained.
explaining在这里的含义是:-- - -book that explains (从现在的角度) / that explained (从当时的角度)。

have 加ing 分词形式作为定语,修饰book
在图书馆,我看到一本解释着如何使用英语语法的有用的书.