单选题Environmental experts point&nb

问题补充：

单选题Environmentalexpertspointoutthat______someseriousproblemssuchasglobalwarming,butitalsocouldthreatenhumanlife.A.not only does increasing pollution causeB.not only causes increasing pollutionC.not only increasing pollution causesD.not only increasing pollution does cause

答案：

A解析这题考查倒装句的用法：not only在句首时，句子用部分倒装。选A。