问题补充：
Mr. Li will go to Guangzhou by air. His workmates are at the airport.
A. turning him off
B. seeing him off
C. taking him off
D. putting him off
答案：
A. turning him off
(答案→)B. seeing him off
C. taking him off
D. putting him off
解析：turn off关掉，拐弯；see off为……送行；take off脱下，起飞；put off推迟，延期。李先生要坐飞机去广州了。他们的同事们正在机场为他送行呢。结合语境可知选B。
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