—Would you like to go fishing with me?    

—_______, but I'm very busy at present.  [ ]

A. I' d love to    

B. I think so

C. I'm afraid not

D. I hope not

By the time I saw the angry expression on his face, I ______ exactly what I was having to face. But not for a moment ______ I should quit.

A．had known; I thought

B．have known; had I thought

C．would know; I would think

D．knew; did I think