问题
选择题
I think ______ necessary for us ______ the birds. [ ]
A. it ; protect
B. its; to protect
C. it's ; protecting
D. it; to protect
答案
答案：D
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I think ______ necessary for us ______ the birds. [ ]
A. it ; protect
B. its; to protect
C. it's ; protecting
D. it; to protect
答案：D