单选题 The doctor asked Bob to quit______because of his health.
【正确答案】 C
【答案解析】解析:语法题。本题考查非谓语动词用法,即:某些特定动词后只能用名词或动名词作宾语,不得使用不定式,故选C。类似的只能用名词、动名词而不可用不定式作宾语的常见动词还有:avoid,miss,finish,stop,deny,enjoy,escape,mind,postpone,suggest,appreciate,keep(on),put off等。