A stubborn boy like him dosen’t learn from his mistakes______ he was punished badly.
A．ifB．whenC．sinceD．unless
D
考查連詞，if 如果， when 當(dāng)什么時(shí)候，since 自從，unless 除非，句意：像他這么笨的男孩根本不會(huì)從錯(cuò)誤中學(xué)習(xí)除非除非他受過嚴(yán)重的懲罰。所以選D。
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