是不是before/after+that/which是固定的时间表达呢?而其中的that/which是指代前面的event的? 这个before/after+that/which一直查不到,而从alien那里也核实了after that平时是挺常用的,只是找不到确定的evidence来证明这个用法... 可是如果which不对: Because Miranda, the smallest moon of Uranus, has a large number of different surface features, including craters, mountains, valleys, and fractures, some astronomers suggest that at one time repeated impacts broke the surface apart, and after which the fragments were subsequently rejoined because of mutual gravitational attraction. A. repeated impacts broke the surface apart, and after which the fragments were subsequently rejoined because of B. repeated impacts on the surface broke it apart, after which the fragments having rejoined with C. through repeated impacts that the surface broke apart, after which the fragments subsequently rejoined by. D. the surface broke apart with repeated impacts, after which the fragments having rejoined through. E. the surface broke apart as a result of repeated impacts , after which the fragments rejoined through. 这个题是选E的...我问了个外教,他说after which是一个time expression. 所以没有问题 |