题目

My father is a good doctor. __________works hard to help his patients. A. He B. Him C. His D. Himself 答案:A【解析】 句意:我爸爸是个好医生。他努力帮助病人。 A. He他,主格; B. Him他,宾格; C. His他的,形容词性物主代词; D. Himself他自己,反身代词。此处缺少主语,应该用代词的主格形式,故答案为 A。点睛:人称代词分为主格和宾格,主格用作主语,宾格用作宾语。如: He is a teacher.(主格 ) Let 已知,则向量的模的大小为( )A.3B.1C.D.2
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