Have you heard anything back from Mr. Mu on Bo Zhu?

Have you heard anything back from Mr. Mu on Bo Zhu? Have you heard back from them?请问这里的back是什么词性?当回信讲? Have you heard from Marry? Have you heard from ___recently? I have not heard back from you yet and I see that the purse You should never go back for anything you have left on the b Have you _ heard of Mr Li? have you heard from janet recently? A: Have you heard from Jim? when have you heard from your —Have you heard from Nelly recently? Have you heard from her __________(recent)?