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9.They are in different(不同的)______,but they are in the same_______.(  )
A.class;schoolB.classes;schoolsC.class;schoolsD.classes;school

分析 他们在不同的班级,但是在同一所学校.

解答 答案:D,考察名词单复数辨析,后句中提到他们在同一所学校,所以是一所学校,用单数,排除BC两个选项;因为是在不同的班级,所以他们所在的至少为两个班,所以应该用复数形式,由此确定答案为D.

点评 考察名词单复数形式的变化,应根据具体的名词类型加以分析后选择

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