If people were a little more tol

If people were a little more tolerant, our world（ ）a better place to live in.

would be

will be

would have been

 had been

本题考查的是将来时态的虚拟语气的使用。

句子为条件状语从句，从句中were说明表示假设虚拟，则主句需用一般将来时态的虚拟语气would+do，故选A选项。

句意：如果人们能够更加宽容一些，我们的世界就会变成一个更适宜居住的地方。