单选题 Some of my colleagues have been extremely zealous in their attempts to get smoking banned in the office.
【正确答案】 A
【答案解析】解析：ardent热心的，热情洋溢的；collaborative合作的，协作的；divisive分裂的；arduous辛勤的，努力的。句意是，我的好几个同事非常热衷于禁止他人在办公室吸烟。所以正确答案为A。