求帮分析这定语从句.John is the only one of the boys who—the piano wel

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  • John is the only one of the boys who—the piano well.A plays B play C playing D are playing

    选A

    定语从句先行词结构是“one of the +复数名词”,引导词充当主语时,谓语用复数形式;

    定语从句先行词结构是“the (only)one of the +复数名词”,引导词充当主语时,谓语用单数形式;

    This is one of the books which have been bought by my teacher.(老师买了很多书)

    This is the (only)one of the books which has been bought by my teacher.(老师只买了一本书)