Environmentalexpertspointoutthat

问题详情：

 Environmental experts point out that ______ some serious problems such as global warming, but it also could threaten human life.

A. not only does increasing pollution cause  B. not only causes increasing pollution

C. not only increasing pollution causes    D. not only increasing pollution does cause

【回答】

A

知识点：倒装与省略

题型：选择题