标题: 问大家一道语法题哦~ [打印本页] 作者: valerialam 时间: 2009-6-12 21:38 标题: 问大家一道语法题哦~ Geologists believe that the Bering land bridge,over which human beings (are thought to have first entered) the America,disappeared about 14,000 years ago when massive glaciers melted and caused the sea level to rise several hundred feet worldwide.(括号中的为划线部分）： A、are thought to have first entered B、were thought first to enter C、were thought at first to enter D、are thought of as first entering E、were thought to first enter 到底是选A还是选E呢？ 作者: WesternCder 时间: 2009-6-12 22:08