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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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关于do的位置，Ron解释过：
如果只有一个名词，没有修饰成分，在平行结构的后半句，可以把helping verb（do / does）放在名词的前面或者后面
例
than my brother does. --> correct （preferred）
than does my brother. --> correct
如果在平行结构的后半部分，名词后面（注意是后面）跟着修饰成分，则必须！把do / does 放在名词之前
例
than my brother, who has never studied literature, does. --> F
than does my brother, who has never studied literature,. --> T
此题不受这个规则影响
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