问题

No, I’m afraid he isn’t in. This is his secretary speaking. Can I help you? — _______.
A:Oh, you will
B:Oh, that’s a pity
C:I should think so
D:Well, I look forward to hearing from you
B:Oh, that’s a pity
C:I should think so
D:Well, I look forward to hearing from you
正确答案是: