Doctors still know little about how the Listeria bacterium is spread and why the

游客2024-01-13  22

问题 Doctors still know little about how the Listeria bacterium is spread and why the disease it causes, listeriosis, afflicts some people in a contaminated area though it spares many others.

选项 A、though it spares
B、where it spares
C、despite sparing
D、when sparing
E、while sparing

答案 E

解析 在why引导的宾语从句中,根据afflicts some people和spares many others在意思上的对比关系,可以断定B、D无法表达出这种对比关系。对于C,根据GMAT公理,despite之后不跟动名词短语,只跟简单的名词短语,因而C错,同时让步语气不符合句意。A、B有一共同错误:it指代问题。因为在划线部分中的it之前,还出现过一个it,从语法上讲,这两者应指代同一对象,即都应指代the bacterium。但从句意上讲,后一个it应指the disease或listeriosis,二者产生矛盾。E最佳,while sparing的逻辑主语就是disease,同时又表明对比关系。
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