◎ 题干
Wash your hands with soap ____ the experiment so as to keep in good health.    
[    ]
A. in the end of                    
B. at the end of  
C. to the end of   
 D. by the end of
◎ 答案
查看答案
◎ 解析
查看解析
◎ 知识点
    根据n多题专家分析,试题“Wash your hands with soap ____ the experiment so as to keep in good health.[ ]A. in the end of B. at the end ofC. to the end ofD. by the end of…”主要考查了你对  【介词和介词短语】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。