完成下列对话：______。
A：I hope I can meet you next Monday.
B：I am afraid I won't be free next Monday. I have a previous engagement.A：______ Tuesday
B：That would be all right.A：Then, I'll ______.A．What about；come to your office at four
B．What about；go to your office at four
C．What do you think of；come to your office at four
D．What do you think of；go to your office at four