【題目】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……,否則……”。根據(jù)句意選A項(xiàng)。but意為“但是”；unless意為“如果不”；都不符合句型要求。

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