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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

试题分析:句意:研究表明如果人们总是坐在电脑面前就有可能患背部的疾病。D项sure“一定”,不符合句意,ABC三个单词都有“可能”的意思,但是只有likely适用于:Sb be likely to do这个句型,BC的主语应该是it,所以选A。
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