Tom and Mike are good friends. They often each other from being punished by the teacher. A

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A. prevent
B. settle
(答案→)C. shelter
D. prefer
解析：考查动词辨析。Prevent sb from doing sth阻止某人做某事；settle定居，解决；shelter庇护，掩护；D宁愿；句意：Tom和Mike是好朋友。他们经常相互掩护以免被老师惩罚。根据句意说明C正确。