题目选项分析

A newly released study on the tectonic plates forming the Pacific basin indicates that a vast percentage of the coastline that is currently home to major world cities, by the time the plates have shifted even a few miles, will become entirely submerged because of global warming

A newly released study on the tectonic plates forming the Pacific basin indicates that by the time they have shifted even a few miles, a vast percentage of the coastline currently home to major world cities already will have become entirely submerged because of global warming