Every male citizen has to ________ the army for at least three years from 18 years old, no matter who he is．A.joinB.serveC.be inD.none ofthe above
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C解析join是一个瞬间动词，所以应该说Every male citizen has to join the army at the age of 18．而serve和be则为持续性动词，那么就应该是Every male citizen has to serve／be in the army for at least 3 years．