◎ 题干
—It's necessary ____ our environment.
—I agree with you.

[     ]

A. protect
B. protecting
C. to protect
D. protects
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“— It's necessary ____ our environment. — I agree with you. [ ]A. protect B. protecting C. to protect D. protects …”主要考查了你对  【不定式】  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。