问题
The organization Wild Aid is to protect wild animals.—It has done a lot so far.
A:has been to, will come back
B:has been to, will return back
C:has gone to, will come back
D:has gone to,will return back;
B:has been to, will return back
C:has gone to, will come back
D:has gone to,will return back;
正确答案是：
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