you did not understand grep's question

he asked if 'having studied ...' can be a subject
This is a present perfect form. I think it can be a subject.

所有跟帖： 

• likely people would put -justjust- ♂ (33 bytes) () 05/08/2009 postreply 20:20:51

• I agree with you, just. this form can be a subject. -戏雨飞鹰- ♀ (0 bytes) () 05/08/2009 postreply 21:32:37

• I might have neglected that ... -billnet- ♂ (756 bytes) () 05/08/2009 postreply 21:57:21