I wasn't sure if he was really interested or if he ________ polite.

A．was just being 

B．will just be

C．had just been 

D．would just be

I wasn’t sure if he was really interested or if he _________ polite．

1. A.
   was just being
2. B.
   will just be
3. C.
   had just been
4. D.
   would just be