Sentence Correction
试题详情
题目：
Most efforts to combat such mosquito-borne diseases like malaria and dengue have focused either on the vaccination of humans or on exterminating mosquitoes with pesticides.
选项:
A、like malaria and dengue have focused either on the vaccination of humans or on exterminating
B、like malaria and dengue have focused either on vaccinating of humans or on the extermination of
C、as malaria and dengue have focused on either vaccinating humans or on exterminating
D、as malaria and dengue have focused on either vaccinating of humans or on extermination of
E、as malaria and dengue have focused on either vaccinating humans or exterminating
答案:
E
提问：
C与E的唯一区别就是exterminating前面的on, 我在做的时候认为两个on可以保持句子的一致性，老师请解释为什么该处不需要第二个on, 如果再遇到类似题目，如何判断介词是否需要重复？
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