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Studies show that people are more ______ to suffer from back problems if they always sit before computer screens for long hours.
A.likelyB.possibleC.probableD.sure
A
动词辨析,主语是people,不能和possible,probable 连用,排除B,C;be sure to do,表示一定要,务必,不符合句意。所以选A。be likely to do sth.,很可能会怎样。 
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