---Do you know ______?

---Sorry, but if he _____ back, I ____ you know as soon as possible.  

A．when will he be back, comes, will let

B．when he will be back, will come, will let

C．what time will he be back, will come, let

D．what time he will be back, comes, will let

通过人际沟通实现的目的，不包括（）

A、学习知识

B、建立关系

C、发挥影响

D、实现自我