【单选题】
A select studentName,Age from student_tb s left join class_tb c on s.class_id = c.class_id
B select studentName,Age from student_tb s right join class_tb c on s.class_id = c.class_id
C select studentName,Age from student_tb s , class_tb c on s.class_id = c.class_id
D select studentName,Age from student_tb s inner join class_tb c on s.class_id = c.class_id
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