Studies show that people are more______to suffer from back problems if they always sit before puter screens for long hours．A.likelyB.possibleC.probableD.sure
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A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。