It's a good thing that you called.

　　四级词汇讲解:

　　It's a good thing that为感谢别人的口语表达，意为“你……(做某事)，真好”。感谢或者夸奖别人行为的句式还有：

　　※ That's very mice of you to…你真是太好了。

　　※ It's big of you to…你……真大方。