Question

fill the preposition I was taken _ by the rude behaviour of my friend

Answer 1

I was taken ABACK by the rude behaviour of my friend.
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Answer 2

Answer :

Collins English Dictionary defines 'to be taken aback' as 'If you are taken aback by something, you are surprised or shocked by it and you cannot respond at once.'

So, the correct sentence is :

I was taken aback by the rude behavior of my friend.

The given sentence means that I was extremely shocked by the rude behavior displayed by my friend and could not react immediately.