Peter，________English every morning．I think it is helpful to you．A.readingB.to readC.readD.reads
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C解析分析：Peter后面有逗号，是呼语，表示“我”对你“Peter”说话，接下来是祈使句，要用动词原形。(延伸)此处的Peter后面如果没有逗号，那么就成了句子的主语，动词就成了谓语，如：Peter reads English every morning．句子还可以这么变化：Peter，Mary reads English every morning．You should learn from her．这里Peter还是呼语。但：Peter and Mary read English every morning．此处．Peter就不是呼语，而是Peter and Mary作为句子的主语。