题目

I could speak their language and ________ with their problems because I had been there. A . interfere B . interpret C . identify D . interact 答案：C某车间要生产一批电视机零件900个，由甲组单独做12天完成，由乙组单独做18天完成，先由甲组做7天，剩下的两组合作，还要几天完成？