听力原文：M: It's already Tuesday morning and we still got a lot of things to be done befor

e the boss gets back. Have you checked the e-mails yet？ Anything from Mr. Hong regarding the recent merchandise shipments？

W: He faxed us the revised shipping documents instead.

M: That' s fine. Why don't you check the new freight rate on the invoice first and put a copy on the boss's desk？ By the way, the boss is still expecting a couple more proposals by the end of this week. Do you have any new ideas？

W: I'm still working on the market research, which has been bugging me since last week. The boss has never really approved this yet.

When do they have to finish their work by？

A．Before they get the e-mail from Mr. Hong

B．Before the woman makes a copy

C．Before the boss arrives at the office

D．Before the boss approves about the market research