How many SMC's students that absent for 7 months?
SMC's students refers to school = 'smc'; absent for 7 months refers to month = 7
SELECT COUNT(T1.name) FROM enrolled AS T1 INNER JOIN longest_absense_from_school AS T2 ON T1.name = T2.name WHERE T1.school = 'smc' AND T2.month = 7