We had never expected to make such a careless mistake in the project.

工程中出现这样的纰漏是万万没有想到的。

youdao

It's careless of you to make such a mistake.

你犯这样的错误真是粗心。

youdao

How careless (it is) of him to make such a mistake!

他是不小心，才会犯下这种错误！

youdao

How careless (it is) of him to make such a mistake!

他是不小心，才会犯下这种错误！

youdao