Sentence examples for this problem has been from inspiring English sources

This problem has been pondered before.

This problem has been put to bed by Bader's book.

The solution to this problem has been largely historically determined.

This problem has been evident in every game this season.

This problem has been compounded by the economic crisis.

A few years ago this problem has been coming.

"This problem has been very odd," Mr. Sturcken said.

"This problem has been in the making for several years".

"But through the A.I.G. investment, this problem has been solved".

This problem has been quite controversial.

This problem has been attracting many researchers.