Google is now following two step process to give Adsense approval.
You apply for the Adsense, they will give a code which you need to insert in your website (or wherever you are publishing, like here in hubpages). For a limited period of time, they will place ads in your pages for review and if they are satisfied with everything they will give the final approval.
Now if Google has already given you a code (which will be in the form of ca-pub-xxxx) you need to insert that in the affiliate code settings in the Hubpages. This is equivalent to putting the code in your website.
Go to my account ==>Earnings==>Settings==>External Affiliate Settings==>
Click on the configure button adjacent to Google Adsense and give your code.
Now you will be officially in the review period of Google.
Hope this helps.