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 will have already become entirely submerged due to global warming by the time they have shifted even a few miles

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