When required to eat vegetables, many children only do so reluctantly.

A. automatically

B. anxiously

C. obediently

D. unwillingly

【答案解析】本题正确选项D。【译文】很多小孩在被强制吃蔬菜时，都是很不情愿地去吃的。【解析】在四个备选项中，A项automatically“自动地”；B项anxiously“紧张地”；C项obediently“顺从地”；D项unwillingly“不愿意地”；题干中的画线词reluctantly意为“不情愿地”与D项unwillingly“不愿意地”意思相近。因此，依据题意本题最符合的选项为D。