school in the Us usually ----------{cover]seven year s 填什么

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schoolintheUsusually----------{cover]sevenyears填什么schoolintheUsusually----------{cover]sevenyears填什么

school in the Us usually ----------{cover]seven year s 填什么
school in the Us usually ----------{cover]seven year s 填什么

school in the Us usually ----------{cover]seven year s 填什么
covers.School是第三人称单数加s.