Can I use the transit VISA coming from Hong Kong and then flying to Bs As?

I entered in China with VISA type L with only one available entry on January 3rd and on Apr 1st (before the 90 days period) and i am going to Hong Kong where as Argentine citizen I don't require VISA and returning to Shanghai on Apr 6th for few hours until I will get another flight to Bs As.

Can I apply for the transit VISA for these hours in Shanghai?

Best regards and thanks in advance
Horacio Merovich