You make a good point. You are right.
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AnonymousWhich denotes opportunity?No. Not "opportunity"; "window".
Anonymousa small window of opportunity to make our views knownHere the window will make our views known. Pretty smart window.
Anonymousa small window of opportunity to make our views known inYes. That's grammatical. It puts "in" quite far from the words it logically goes with, but it's grammatical.