a. He showed me an article which he wrote last night and which was about whales.
Could 'last night' modify 'showed'?
Could the sentence mean: Last night he showed me an article which he wrote and which was about whales.
I know that (a) is an awkward sentence, but I think it is grammatical. I want to see if it is ambiguous. To me it seems that 'last night' can only modify 'wrote', but I am not sure about that.