Many friends sent me e-mail to me on the birth of my son.
A. celebrate
B. reward
C. express
D. congratulate
网友回答
A. celebrate
B. reward
C. express
(答案→)D. congratulate
解析：考察动词，celebrate庆祝 reward 奖励 express 表达 congratulate祝贺
句意为，很多朋友发了E-mail给我来庆祝我儿子的出生、