各位高手好 小弟有二个问题想请教 第一个: 32. The Chicago and Calumet Rivers originally flowed into the St. Lawrence by way of Lake Michigan, but having been redirected by constructing canals so that the water now empties into the Mississippi by way of the Illinois River. (A) Rivers originally flowed into the St. Lawrence by way of Lake Michigan, but having been redirected by constructing (B) Rivers had originally flowed into the St. Lawrence by way of Lake Michigan, but they have been redirected by constructing (C) Rivers, which originally flowed into the St. Lawrence by way of Lake Michigan but have been redirected by the construction of (D) Rivers, originally flowing into the St. Lawrence by way of Lake Michigan, but having been redirected by the construction of (E) Rivers, originally flowing into the St. Lawrence by way of Lake Michigan, have been redirected through the construction of 删到剩BE挣扎 为何B的过去完成式不好?? 答案是E 第二个问题: 43. Although ice particles in the upper atmosphere benefit Earth in that they reflect and absorb solar radiation, acting as a global thermostat and thus keeping Earth from either burning up or freezing over, they also accelerate the destruction of the ozone layer by reacting with chlorofluorocarbons (CFC's). (A) acting as a global thermostat and thus keeping Earth from either burning up or freezing over, they also accelerate (B) acting as a global thermostat and thus keeping Earth either from burning up or freezing over, while also accelerating (C) act as a global thermostat and thus keep Earth from either burning up or freezing over, while also accelerating (D) they act as a global thermostat that thus keeps Earth either from burning up or freezing over, even though it also accelerates (E) they act as a global thermostat to thus keep Earth from either burning up or freezing over, but they also accelerate 答案是A 但为何A的acting不会错误修饰到solar radiation 这个问题困扰我很久了 因为像下面这题 42. During the same period in which the Maya were developing a hieroglyphic system of writing, the Aztec people also developed a written language, but it was not as highly sophisticated as that of the Maya and was more pictographic in nature. (A) but it was not as highly sophisticated as that of the Maya and was (B) but it was not as highly sophisticated as the Maya, being (C) but, not as highly sophisticated as the Maya's, was (D) not as highly sophisticated as that of the Maya, however, being (E) not as highly sophisticated as the Maya's however, it was D选项中的being修辞笔记说会错误修饰maya 所以不选 那42和43的分词究竟差在哪里 为何一个可以选一个不能选?? 希望请各位大大赐教 谢谢~~