_______ in doing his homework , he didn’t know I had walked in. A.Burying B.Buried C.To Bury D.To be...
2022-10-09 22:37:03 202次 2016-2017学年内蒙古高一上期中考试英语卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
_______ in doing his homework , he didn’t know I had walked in.
A.Burying B.Buried
C.To Bury D.To be buried
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