Studies show that people are more______to suffer from back problems if they always sit before computer screens for long hours．


  1. A.
    likely
  2. B.
    possible
  3. C.
    probable
  4. D.
    sure
A
解析：
考查sb. be likely to do sth.某人很可能會(huì)做某事。Possible和probable 不能用人作主語，be sure to do.肯定會(huì)，一定會(huì)，sure無比較級(jí)變化，所以不能和more連用。選A。
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