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Which sentence uses a comparative adjective correctly? This test is more hard than the last one., This test is harder than the last one., This test is hard than the last one., None of these

Which sentence uses a comparative adjective correctly? This test is more hard than the last one., This test is harder than the last one., This test is hard than the last one., None of these

Explanation

This test is harder than the last one.

"Harder" is the correct comparative form of "hard" to compare two things.