问题
选择题
I think ______ is necessary ______ us to do something to protect birds. [ ]
A. this, for
B. it, of
C. this, of
D. it, for
答案
答案：D
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I think ______ is necessary ______ us to do something to protect birds. [ ]
A. this, for
B. it, of
C. this, of
D. it, for
答案：D