扫描二维码，直接登录
题库 / Prep2007E2-SC-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.
Rivers originally flowed into the St. Lawrence by way of Lake Michigan, but having been redirected by constructing
Rivers had originally flowed into the St. Lawrence by way of Lake Michigan, but they have been redirected by constructing
Rivers, which originally flowed into the St. Lawrence by way of Lake Michigan but have been redirected by the construction of
Rivers, originally flowing into the St. Lawrence by way of Lake Michigan, but having been redirected by the construction of
Rivers, originally flowing into the St. Lawrence by way of Lake Michigan, have been redirected through the construction of
EB区分：
AB： by contrusting, 意味着，rivers主动去construct, 不正确：by constructing 是状语修饰be redirected因此需要判断construct的发出者，这里用状语默认是主语发出这个动作，可是主语不是发出者，而是动作的对象
CD: 无谓语
登录 或 注册 后可以参加讨论