Sentence examples for proved a difficult question from inspiring English sources

This has proved a difficult question to answer.

It proved a difficult sell.

This proved a difficult promise to keep.

But Seoul proved a difficult research subject.

It has proved a difficult assignment.

For Winer, success proved a difficult pill to swallow.

Accessing a sample of migrant nurses proved a difficult task.

It's a difficult question.

That's a difficult question.

That is a difficult question.

It's just a difficult question".