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Help others whenever you can ______ you will make the world a nicer place to live in.
A．a(chǎn)ndB．orC．unlessD．but
A
“祈使句+and+句子”表示“做某事……,那么……”�！捌硎咕�+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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