【题目】He studied very hard.（改为否定句）
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【答案】He didn’t study very hard.
【解析】
句意为他学习很努力。此句是一般过去时，改为否定句，应该借助于助动词did，用didn’t来完成，后面的动词应该用动词原形，故答案为He didn’t study very hard.
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