单选题 She could have cried, but she had no time to dwell ______her disappointment, for suddenly a harsh voice hailed her from below.
A. on B. at C. in D. for

【正确答案】 A

【答案解析】[解析] 根据句中“思量自己的挫败”可知，只有A项符合题意。dwell on意为“老是想着；停留在”，A项与题意相符，因此A项为正确答案。