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    【题目】Help others whenever you can _______ you will make the world a nicer place to live in.

    A.andB.orC.unless D.but

    【答案】A

    【解析】“祈使句+and+句子”表示“做某事……,那么……”。“祈使句+or+句子”表示“做某事……,否则……”。根据句意选A项。but意为“但是”；unless意为“如果不”；都不符合句型要求。

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