As the road to the airport is under reconstruction we'd better early to avoid the traff

问题补充：

As the road to the airport is under reconstruction, wed better early to avoid the traffic jam.

A. pay off

B. set off

C. put off

D. take off

答案：

A. pay off

(答案→)B. set off

C. put off

D. take off

解析：B 考察动词短语辨析。句义：因为通向机场的道路正在重建中，我们最好早点出发以避免交通堵塞。Set off出发，符合题意。Pay off还清，成功；put off推迟；take off起飞，脱下。根据句义说明B正确。