Those two boys are ________a fight—they've been on the edge of a quarrel all day.
句意：那两个男孩正准备打一架——他们一整天都处在大吵一架的边缘。itch for渴望。turn away from对……感到厌烦。wait for等待。prepare for为……做准备。因此，本题的正确答案为D。