He learned swimming all by _____.A. he B_爱下问搜题

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问题选择题

He learned swimming all by _____.

A. he
B. him
C. his
D. himself

答案

答案：D

问答题

Insurance policy

填空题

在液体制剂中，使蛋白质类药物稳定化的方法分为两类：改造其结构或者（）。