As he , he was surprised to see that the man had disappeared.
A. turned against
B. turned in
C. turned around
D. turned up
网友回答
A. turned against
B. turned in
(答案→)C. turned around
D. turned up
解析：句意：当他转过身，他很吃惊看见那个人不见了。turn against转而反对；turn in上交；turn around转过身；turn up调大音量，出现。根据句意故选C。