单选题 Most good writers use every means ______ to make the reader's way smooth and easy.
A. at their disposal B. at their request
C. at their will D. at their convenience

【正确答案】 A

【答案解析】[解析] at one's disposal意为“听其使用，听其支配”，如：My bike is at your disposal．我的自行车随便你骑。at one's request则意为“应……的要求”，如：He came at my request．他应我的请求而来。at will是个固定搭配，作“随意地”讲，如：You may come and go at will．你可以随意来去。at one's convenience意为“在方便的时候”，如：Do this at your convenience．你方便的时候做这件事。