I kept on _______ my homework until it was dark yesterday afternoon. A. do B. did C. doing
2022-11-15 11:23:53 78次 江苏省南通市通州区2017届九年级下学期第一次联考英语试卷 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
I kept on _______ my homework until it was dark yesterday afternoon.
A. do B. did C. doing
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