Studies show that people are more to suffer from back problems if they always sit before puter screens for long hours．
A. likely
B. possible
C. probable
D. sure
网友回答
(答案→)A. likely
B. possible
C. probable
D. sure
解析：考查sb. be likely to do sth.某人很可能会做某事。Possible和probable 不能用人作主语，be sure to do.肯定会，一定会，sure无比较级变化，所以不能和more连用。选A。