关键字:英语 更新时间:2019-06-30 20:36:18 124次访问
求大佬解答
Although Professor Smith had several research assistants, most of the research was done by __________ alone.
A. he B. him C. his D. himself
D
by后面都是跟上这个
表示靠自己
相关标签:英语
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