When she heard the shot, she dashed there at once ( ) to find

When she heard the shot, she dashed there at once ( ) to find a baby elephant shot dead.
A、just
B、only
C、then
D、about
【正确答案】：B
【题目解析】：only to do sth.不料发现，全句含义为当她听到枪声时，她迅速冲出不料却发现一只幼象枪击中了。