精选优质文档-倾情为你奉上英语专业四级语法练习题1. Space exploration promises to open up many new territories for human settlement, as well as the harvest of mineral resources.A. leads to B. to lead to C. leading to D. lead to2. Someday, solar power collected by satellites the earth may give us all the energy we need for an expanding civilization.A. circled B. to circle C. circling D. circles3. In th
