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20. Last Sunday when Mr Wang was leaving Beijingfor Canada, a number of his friend ______ at the airport.
A. found him out
B. put him up
C. knocked him down
D. saw him off
大意：上周日王先生将从北京出发到加拿大，他的许多朋友在机场（ ）
词义解析：
A. found him out发现他
B. put him up为他提供食宿（更多含义：推荐）
C. knocked him down击倒他
D. saw himoff为他送行
解析：考察对动词词组含义的理解，注意平时词组的积累，根据句子含义，关键词airport机场，可得出答案D。
参考译文：上周日王先生将从北京出发到加拿大，他的许多朋友在机场为他送行。
