下列化合物中质子化学位移最大者是

A、CH[img=~/QImg/2013-10-14-10-14-34/image003.jpg]Br
B、CH[img=~/QImg/2013-10-14-10-14-34/image003.jpg]F
C、CH[img=~/QImg/2013-10-14-10-14-34/image003.jpg]Cl
D、CH[img=~/QImg/2013-10-14-10-14-34/image003.jpg]I