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题库 / Prep2007E1-SC-128
According to a study published in The New England Journal of Medicine, aspirin prevents blood clots just as well as a commonly used and more expensive blood-thinning drug does.
prevents blood clots just as well as a commonly used and more expensive blood-thinning drug does
prevents blood clots just as well as does a commonly used and a more expensive blood-thinning drug
prevents blood clots just as well as will a commonly used and more expensive blood-thinning drug
works just as well as a commonly used and more expensive blood-thinning drug at the prevention of blood clots
works just as well as does a commonly used blood-thinning drug, which is also more expensive, at preventing blood clots
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(A) 正确，aspirin与blood-thinning drug在prevent blood clots上的比较，does指代prevents，补出以 避免歧义。
(B) a commonly used and a more expensive中的第二个冠词a多余，使得句意变化，成为两种drug。
(C) 助动词will应该为does，因为原句用的一般现在时prevents则不是将来时态。
(D) works at prevention of…的表达方式啰嗦；缺少助动词does。
(E) works at preventing…的表达方式啰嗦；which引导定语从句修饰drug啰嗦，不如直接用形容词作定语。
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