"I can't believe it" is a fixed expression that cannot take "this". It is an exaggeration that expresses astonishment. It is the correct form for your example.
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"I can't believe it" is a fixed expression that cannot take "this". It is an exaggeration that expresses astonishment. It is the correct form for your example.
Of course, you can say "I can't believe this", too, but not in the same way. It expresses something more like exasperation over a specific situation and it is often introductory: (Looking at the new tax bill) "I can't believe thi