Mr Smith is coming to Beijing next Sunday. By the time he arrives, we ____ here for 10 days.  

A.have been staying  B. have stayed  C. shall stay  D. will have stayed.  

Mr. Smith is coming to Beijing next Sunday. By the time he arrives we ____ here for ten days.

A．have been staying                                       B．have stayed

C．shall stay                                                   D．will have stayed

Mr．Smith is coming to Beijing next Sunday．By the time he arrives we ________ here for ten days．

1. A.
   have been staying
2. B.
   have stayed
3. C.
   shall stay
4. D.
   will have stayed