单选题 We are carrying out market research in the north and the Midlands from 22nd-26th. A. We have done the research in the north and the Midlands. B. We haven't done the research in the north and the Midlands yet. C. We have decided not to do research in the north and the Midlands.

【正确答案】 B

【答案解析】be doing 表示计划中的，将要做什么，所做的事还有进行，故选B。