根据魔方格专家分析，试题“They waited and waited, and _____ he came back. [ ]A. at once B. at first C. at the end D. at last …”主要考查了你对 【时间副词】 等知识点的理解和应用能力。关于这些知识点的“档案”，你可以点击相应的链接进行查看和学习。
◎ 相似题
与“They waited and waited, and _____ he came back. [ ]A. at once B. at first C. at the end D. at last ”考查相似的试题有：
