In my opinion，keeping dogs should not be banned，but to certain areas.A. limitedB. limitin

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(答案→)A. limited
B. limiting
C. to limit
D. to be limited
解析：句意：在我看来，不应该禁止养狗，但要限制在某些特定的区域。but后的句子补充完整为；but keeping dogs should be limited to certain areas。