Martin was so busy ______ the old that he gave up his part-time job. A.helping B.helped C.to help D....
2022-12-30 04:45:40 69次 2015年初中毕业升学考试（上海卷）英语（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
Martin was so busy ______ the old that he gave up his part-time job.
A.helping B.helped C.to help D. help
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