新东方网GMAT频道在此和大家分享GMAT语法练习题OG2015-SC-138，希望对大家掌握GMAT语法有所帮助。
(OG2015-SC-138)
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.
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
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