Tom and Mike are good friends. They often each other from being punished by the teacher.A.preventB.settleC.shelterD.prefer
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C解析试题分析：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。
考点：考查动词辨析。
点评：要根据上下文的语义和语境在辨析使用，平时对于重要的动词要加强识记并注意动词的固定搭配。