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
動(dòng)詞辨析，主語(yǔ)是people，不能和possible，probable 連用，排除B,C；be sure to do,表示一定要，務(wù)必，不符合句意。所以選A。be likely to do sth.,很可能會(huì)怎樣。 
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