I was surprised .
A. watching him to eat so quickly
B. watch him eat so quickly
C. watching him eat so quickly
D. to watch him eat so quickly
网友回答
A. watching him to eat so quickly
B. watch him eat so quickly
C. watching him eat so quickly
(答案→)D. to watch him eat so quickly
解析：本题考查非谓语动词。句中考查短语be surprised to do很惊讶的做某事。句意：我很惊讶的看到他吃饭如此的快。