we didn't see a single solutions of the problem - Мы не видели ни одного решения проблемы.
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Ответ:

We didn't see a single solutions of the problem

Didn't we see a single solutions of the problem? общий

Why didn't we see a single solutions of the problem? специальный

Didn't we or you see a single solutions of the problem? альтернативный  

Who didn't see a single solutions of the problem? к подлежащему

We didn't see a single solutions of the problem, did we? разделительный

Объяснение: