单选题 Our journey was slow because the train stopped______at different villages.
A. gradually B. continuously C. constantly D. continually

【正确答案】 D
【答案解析】[解析] gradually意为“逐渐地”；continuously意为“连续不断地，接连地”；constantly 意为“不断地”；continually意为“一再，老是”。