I think ______ is necessary ______ us to do something useful to protect the birds. A. this; for B. i...
2023-02-24 17:25:15 146次 2011-2012学年江苏省宜兴市九年级上学期期中考试英语卷 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
I think ______ is necessary
______ us to do something useful to protect the birds.
A. this; for B. it; of
C. this; of D.it;for
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