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

分析：谭嗣同《有感一章》“世间无物抵春愁，合向苍天一哭休。四万万人齐下泪，天涯何处是神州？”