24. ---Why are they taking all the equipment away?

---The job ____, they are packing up to leave.

A. done                 B. being done                C. was done    D. having done

【解析】A：本句最重要的标志符号为第二句两段之间的逗号：前后如为主句和从句之间关系，必有连词。既然没有连词，且后一句为完整句，前半部分势必为独立主格结构。排除C项；B、C分别因时态和语态不正确被排除。

三、交际口语类