标题: 关于Parallelism的小白问题~~ [打印本页] 作者: yc青蛙 时间: 2012-9-15 22:38 标题: 关于Parallelism的小白问题~~ 先上到OG12的题目 14. Sunspots, vortices of gas associated with strong electromagnetic activity, are visible as dark spots on the surface of the Sun but have never been sighted on the Sun's poles or equator. (A) are visible as dark spots on the surface of the Sun but have never been sighted on (B) are visibleas dark spots that never have been sighted on the surface of the Sun (0 appear on the surface of theSun as dark spots although never sighted at (D) appear as dark spots on the surface of the Sun, although never having been sighted at (E) appear asdark spots on the Sun's surface, which have never been sighted on