问题

know, the coming ofradio in this century made ocean sailing much ______
A:Sorry, he is busy at the moment
B:Why didn’t you call earlier
C:Certainly May I know your name
D:Sorry, he doesn’t want to see you
B:Why didn’t you call earlier
C:Certainly May I know your name
D:Sorry, he doesn’t want to see you
正确答案是: