◎ 题干
It's necessary _______ us to keep our pets clean everyday.

[     ]

A. of
B. for
C. with
D. between

◎ 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“It's necessary _______ us to keep our pets clean every day. [ ]A. of B. for C. with D. between …”主要考查了你对  【介词】  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。