Try sending an email to your yahoo.cn address to see whether it can still receive new emails or not. Do a test by sending an email directly to yourself from that account, then using another email account.
If you will get a mail delivery failure notice after a few minutes, it confirm that your account can no longer receive emails, unfortunately.
In case your account can receive emails, try adding email@example.com to your contacts to be sure that you will receive the security code to recover your account.
For the steps to recover a Yahoo account, see this article.