Hi, This sentence seems strange to me because 'amazement' is not normally considered a thought. I would expect 'My first reaction was amazement' or 'My first reaction was one of amazement'. It's not easy to come up with a context in which you'd say the sentence as originally written.
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HSSMy first thought was amazementThis impresses me as the sort of thing that can happen in spontaneous speech. We start a sentence one way, stumble and slip on the logic (or simply disregard it in our enthusiasm), and veer off at some obtuse angle to another related but oddly diagonal, though not completely unsatisfactory, ending.
CliveThis may sound off topic, but I will ask you anyway. I keep seeing the construct "A is of B," and I normally take it to mean "A is one
[2] My reaction was of amazement. This does not seem completely grammatical to me.