In chatting with Vera, Framton showed “a tone o distinct regret” about the visits he was supposed to pay. Because_______.（ ）

A、He suspected that he was not so welcome
B、He didn't think these visits would really help cure the problem with his nerves
C、He wasn't sure whether Mrs. Sappleton was one of those nice people his sister referred to
D、He felt embarrassed about the fact that he knew hardly anyone around the area