I have a question about my X visa

Hello, this is Nabeel from Lahore,I went to Beijing in august last year trough an x to study a Chinese language course of 10 months. I came to Pakistan in January this year for vacations and now i want to go back to complete my course which will end in July. I have only 1 entry mentioned and i already have been there once as i told you above. Is mine expired? do i have to make a new one or is it possible that another entry to china could be added to my same one? please answer as soon as possible