Question

It's no use ( ) to him.He never answered letters。

It's no use ( ) to him.He never answered letters. A write B wrote C writ

Answer 1

It's no use ( ) to him.He never answered letters. A write B wrote C writ
本题虽然答案未给完整，但是It's no use doing sth.是一个常用的句子结构，意为“做某事是无用的”，因此可想而知，后面选项中应有一个为writing.

Answer 2

writing
给他写信是没有用的。他从来不回信。