B“二十分钟前他们开始打扫教室”
start doing sth = start to do sth “开始做某事”
They started _____ the classroom twenty minutes ago. A. clean B. cleaning C. cleans D. cleaned
They started _____ the classroom twenty minutes ago. A. clean B. cleaning C. cleans D. cleaned
英语人气：363 ℃时间：2020-03-22 20:49:22
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